The halfskyrmion carries a topological charge of 0. The formation of a skyrmion crystal and its phase transition are studied, taking into account the dzyaloshinskiimoriya dm interaction at the interface between a ferroelectric layer and a magnetic layer in a superlattice. The dzyaloshinskiimoriya interaction dmi in the wire structure induces a tilt angle to the injected dw. Introduction in a magnetically ordered solid the collective magnetic excitations are called magnons. Hysteresis of nanocylinders with dzyaloshinskiimoriya. Exact solutions for a ferromagnet with dzyaloshinskii. Voltagecontrolled magnetic anisotropy and voltageinduced dzyaloshinskii moriya interaction change at the epitaxial fe001mgo001 interface engineered by co and pd. Pdf voltagecontrolled magnetic anisotropy and voltage. Ground state and spinwave spectrum of cubic magnets with the dzyaloshinskiimoriya interaction dmi such as mnsi and fege are studied theoretically. Read dzyaloshinskiimoriya interactions and magnetic texture in fe films deposited on transition. In ptcopt, altering the substrate temperature during deposition of the top copt bilayer in the range of 100 c to 300 c formed a peak in total interfacial disorder with. We studied the spin torque efficiency and the dzyaloshinskiimoriya interaction dmi of heterostructures that contain. Dzyaloshinskiimoriya interaction and spin reorientation transition in the frustrated kagome lattice antiferromagnet.
Cubic magnets with dzyaloshinskiimoriya interaction at. Apr 15, 2016 for this goal two regions were defined as top and bottom layers. Recently, skyrmions stabilized by the dzyaloshinskiimoriya interaction have been studied extensively. Antisymmetric exchange, also known as the dzyaloshinskii moriya interaction dmi, is a contribution to the total magnetic exchange interaction between two neighboring magnetic spins, and. Orbit torque and tunable dzyaloshinskiimoriya interaction generated by low. The canted moment on a single kagome plane is a result of the dzyaloshinskiimoriya interaction. By selecting a block of two or three spins, we have solved the hamiltonian. Dzyaloshinskiimoriya interaction and spin reorientation. We consider both the moriya mechanism of the antisymmetric. Tightbinding model and ab initio calculations vikas kashid department of physics, university of pune, pune 411007, india timo schena, bernd zimmermann, yuriy mokrousov, and stefan blugel. Note that from a point of view of practical applications this does not alter the usefulness of developing systems with dzyaloshinskiimoriya interaction, as such applications depend strictly on the topology of the skyrmions, or lack thereof, which encodes the information, and not the underlying mechanisms which stabilize the necessary topology. Overcoming the limits of the interfacial dzyaloshinskiimoriya interaction by antiferromagnetic order in multiferroic heterostructures.
Dzyaloshinskiimoriya driven helicalbutter y structure in. The evaluated magnetic parameters were used in study of asymmetrical bubble expansion and brillouin light spectroscopy bls spectra to derive the strength of interfacial dzyaloshinskiimoriya interaction dmi in the. Pollard,3 marco beleggia,4 tanmay dutta,3 hyunsoo yang,3 and yimei zhu1,2, 1condensed matter physics and materials science division, brookhaven national laboratory, upton, new york 11973, usa. Frustration is introduced in both magnetic and ferroelectric films. In contrast to conventional assumptions, we show that the dzyaloshinskiimoriya interaction can be of nonrelativistic origin, in particular in materials with a noncollinear magnetic configuration, where nonrelativistic contributions can dominate over spinorbit effects. We show that the electric field ef can control the domain wall dw velocity in a ptcopd asymmetric structure. The skyrmion hall effect is theoretically studied in the chiral ferromagnetic film with spatially modulated dzyaloshinskiimoriya interaction. Hysteresis of nanocylinders with dzyaloshinskiimoriya interaction. Here, we report on the dynamics of a propagating dw in a bifurcated ferromagnetic wire with perpendicular magnetic anisotropy pma. The dzyaloshinskiimoriya interaction dmi is a chiral interaction that favors formation of domain walls. Dzyaloshinskiimoriya driven helicalbutter y structure in ba3nbfe3si2o14. Spin dynamics simulation shows that a critical magnetic field of 2. A modulated component of the moments along the caxis is present, adding.
Dzyaloshinskiimoriya interaction and magnetic ordering in. We study domain wall dw motion induced by spin waves magnons in the presence of dzyaloshinskiimoriya interaction dmi. Theory of magnons in spin systems with dzyaloshinskiimoriya. Effects of spatially engineered dzyaloshinskiimoriya. Although some experimental efforts have been recently proposed to quantify these interactions and the underlying physics, it is still far from trivial to address the. Direct measurement of interfacial dzyaloshinskiimoriya. Interface morphology and dzyaloshinskiimoriya interaction in. Most attention in the paper centers around the derivation of the dzyaloshinskii vector, its value, orientation, and sense sign under different types of the superexchange interaction and crystal field.
Electric field control of magnetic domain wall motion via. Attempts to quantify the dmi vector have utilized xray diffraction interference, brillouin scattering, electron spin resonance, and neutron. Effect of interfacial intermixing on the dzyaloshinskii. In this paper we reveal theoretically the effects of spatially varied dmi on the. For h sep 14, 2019 besides, recent works demonstrate that the strong soc of the heavy metal combining with the atomic spins of the ferromagnet could form an antisymmetric exchange coupling called dzyaloshinskiimoriya interaction dmi 12. The dzyaloshinskii moriya dm interaction in metals is an important mechanism for many magnetic properties. Asymmetric hysteresis for probing dzyaloshinskiimoriya. Unlike angular momentum exchange between the dw and spin waves, linear momentum. The dzyaloshinskiimoriya interaction dmi has been recently recognized to play a crucial role in allowing fast domain wall dynamics driven by spinorbit torques and the generation of magnetic. Dzyaloshinskiimoriya interaction in the continuum limit. The currentinduced domain wall motion along a thin cobalt ferromagnetic strip sandwiched in a multilayer ptcoalo is theoretically studied with emphasis on the roles of the rashba field, the spin hall effect, and the dzyaloshinskiimoriya interaction. The dzyaloshinskiimoriya dm interaction was proposed. We present a schwingerboson approach to the heisenberg model with dzyaloshinskii moriya interaction. The dzyaloshinskii moriya interaction dmi has been recently recognized to play a crucial role in allowing fast domain wall dynamics driven by spinorbit torques and the generation of magnetic.
Imaging the expansion of magnetic domains in an inplane field using widefield kerr microscopy, we determine the interfacial dzyaloshinskiimoriya interaction dmi in films in the deposition temperature range 100 c to 300 c. Measuring the dzyaloshinskiimoriya interaction in a weak. Heisenberg model with dzyaloshinskiimoriya interaction. We show that antisymmetric exchange interactions dgh. Dzyaloshinskiimoriya interaction and magnetic anisotropies. The latter is the dzyaloshinskiimoriya interaction, which can be expressed in terms of a dzyaloshinskiimoriya vector, d, and the vector product of spins, leading to a spindependent energy. Additionally, the dzyaloshinskiimoriya interaction of the cr 2 i 3 br 3 bilayer can also be modulated by the combination modes. In uptge the hierarchy of the interactions is opposite.
A tightbinding model analysis reveals that this spc is mainly mediated by the dzyaloshinskii moriya interaction rather than the usual exchange interaction. View the article pdf and any associated supplements and figures for a period of 48 hours. Currentdriven domain wall motion along high perpendicular. Controlling domain wall dw motion in complex magnetic network structures is of paramount signi. The interfacial dzyaloshinskiimoriya interaction dmi is intimately related to the prospect of superior domainwall dynamics and the formation of magnetic skyrmions. Therefore, the dmi is naturally induced in the doubleinterface mtj with fmhm structures. Dzyaloshinskymoriya interactions induced by symmetry breaking. In u 2 pd 2 in, the magnetic anisotropy plays the leading role, followed by the dzyaloshinskii moriya interaction dmi interaction specifying the chirality of the structure. Firstprinciples evaluation of the dzyaloshinskiimoriya. In this work, we study the rotating magnetic field driven domain wall. Dzyaloshinskiimoriya interaction in ptcoir and ptcoru. Interfacial dzyaloshinskiimoriya interaction, surface anisotropy energy, and spin pumping at spin orbit coupled irco interface namhui kim, jinyong jung, jaehun cho, dongsoo han, yuxiang yin, juneseo kim, henk j. The interfacial morphology and the dzyaloshinskiimoriya interaction dmi have been investigated in thin films of perpendicularlymagnetised epitaxial pt30 aco7 apt10 a and pt30 aco7, 9, 11 air20mn8020, 50 a.
For h pdf final ethesis complete pdf download 25mb. Overcoming the limits of the interfacial dzyaloshinskii. Apr 18, 2019 the dzyaloshinskiimoriya interaction dmi is well known to favor a chiral rotation of the magnetic moments, which accounts for the emergence of the skyrmions. Condensed matter free fulltext dzyaloshinskiimoriya.
Calculation of the dzyaloshinskiimoriya interaction in ultrathin. The dmi exerts a torque on the dw when spin waves pass through the dw, and this torque represents a linear momentum exchange between the spin wave and the dw. Improvement of the interfacial dzyaloshinskiimoriya. However, the stabilization of antiskyrmions is less straightforward. Direct imaging of an inhomogeneous electric current. Magnondriven domainwall motion with the dzyaloshinskii. In magnetically ordered systems, it favors a spin canting of otherwise antiparallel aligned magnetic moments and thus. Dzyaloshinskiimoriya interaction qingqiu wu,1 weihai ni,1 and wenlong you1.
In contrast to conventional assumptions, we show that the dzyaloshinskii moriya interaction can be of nonrelativistic origin, in particular in materials with a noncollinear magnetic configuration, where nonrelativistic contributions can dominate over spinorbit effects. Pdf effect of dzyaloshinskii moriya interaction on magnetic. The interfacial dzyaloshinskiimoriya interaction idmi in asymmetric magnetic multilayer films has displayed increasingly important roles in the modification of domain walls, stabilization of skyrmions, and realization of new topological spin. Here, the interatomic exchange interaction does not play important role. We are glad to announce that the international workshop on dzyaloshinskiimoriya interaction and exotic spin structures dmi 2017 will take place in peterhof, russia on may 23 26, 2017. Improvement of the interfacial dzyaloshinskiimoriya interaction by introducing a ta buffer layer namhui kim,1 dongsoo han,2 jinyong jung,1 jaehun cho,1 juneseo kim,2,a henk j. We quantify this interaction in the framework of the l. Interface morphology and dzyaloshinskii moriya interaction in ptco thin films wells, adam william john 2017 interface morphology and dzyaloshinskii moriya interaction in ptco thin films. The roles of the dzyaloshinskiimoriya interaction on the wall motion are clarified. Moreover, it is found that the dzyaloshinskiimoriya interaction dmi, the key ingredient for the manipulation of chiral spin arrangements. Feb 29, 2012 the dzyaloshinskii moriya interaction in metals. We write the anisotropic interactions in terms of schwinger bosons keeping the correct symmetries present in the spin representation, which allows us to perform a conserving meanfield approximation.
Symmetry free fulltext skyrmion crystals and phase. In this study, we demonstrate that in taco20fe60b20mgo the dmi may be influenced by annealing. Phases of spin chains with uniform dzyaloshinskiimoriya. These chiral magnetic structures have promising properties for. Unlimited viewing of the articlechapter pdf and any. One of them describes a clockwise helix configuration, that characterizes the ground state of the system. Dzyaloshinskiimoriya interaction and chiral magnetism in. Dzyaloshinskiimoriya interaction and domain wall motion in. Antisymmetric exchange, also known as the dzyaloshinskiimoriya interaction dmi, is a contribution to the total magnetic exchange interaction between two neighboring magnetic spins, and. Swagten,2 and chunyeol you 1,b 1department of physics, inha university, incheon 402751, south korea 2department of applied physics, center for nanomaterials, eindhoven university of technology, po box 5. Here, using numerical simulations we demonstrate that antiskyrmions can be a stable spin configuration in the presence of anisotropic dzyaloshinskii moriya interaction. We find that the antisymmetric exchange interaction, commonly known as the dzyaloshinskiimoriya interaction dmi, contributes significantly. Dzyaloshinskiimoriya interaction and chiral magnetism in 3d. Three cases including linear, sinusoidal, and periodic rectangular modulations have been considered, where the increase, decrease, and the periodic modification of the size.
Pdf effect of dzyaloshinskii moriya interaction on. The dzyaloshinskiimoriya interaction has proven difficult to experimentally measure directly due to its typically weak effects and similarity to other magnetoelectric effects in bulk materials. Interface morphology and dzyaloshinskiimoriya interaction. Then magnetic parameters were set for this two regions. We start with the sd exchange model and spinorbit interaction for weak itinerant ferromagnetic systems to establish the form of dm interaction for metallic magnetic systems. Role of dzyaloshinskiimoriya interaction for magnetism in transitionmetal chains at. Exact solutions for a ferromagnet with dzyaloshinskiimoriya. We present an overview of the microscopic theory of the dzyaloshinskiimoriya dm coupling in strongly correlated 3d compounds. Dzyaloshinskiimoriya interaction and spiral order in spin. The dzyaloshinskiimoriya interaction in metals iopscience.
The dzyaloshinskiimoriya dm interaction in metals is an important mechanism for many magnetic properties. Dzyaloshinskiimoriya interaction and spinorbit torque at the irco. Antisymmetric exchange, also known as the dzyaloshinskiimoriya interaction dmi, is a. Interlayer dzyaloshinskiimoriya interactions request pdf.
Orbitalchanging hopping terms allowed by the symmetry. A method based on the interference of synchrotron xray radiation is now shown to. S j reduces symmetry to u1 rotations about d axis easy plane anisotropy perp. Moreover, modulation of a dw velocity exceeding 100 ms is demonstrated in this study. China we consider a class of onedimensional compass models with staggered dzyaloshinskiimoriya exchange interactions in an external transverse magnetic. Effect of annealing on the interfacial dzyaloshinskii. The canted moment on a single kagome plane is a result of the dzyaloshinskii moriya interaction. The dzyaloshinskiimoriya interaction and magnetic skyrmions.
The effect of the dzyaloshinskii moriya interaction on the vortex in magnetic microdisk was investigated by micro magnetic simulation based on the landau lifshitz gilbert equation. We investigate the multipartite entanglement and trace distance of the onedimensional anisotropic spin12 xxz spin chain with the dzyaloshinskiimoriya interaction and find that the dzyaloshinskiimoriya interaction can influence the entanglement distribution and increase the proportion of multipartite entanglement in the entanglement structure. The effect of a uniform magnetic field on the ground state phase diagram of the model is studied. In u 2 pd 2 in, the magnetic anisotropy plays the leading role, followed by the dzyaloshinskiimoriya interaction dmi interaction specifying the chirality of the structure. Pdf role of dzyaloshinskiimoriya interaction for magnetism in. In onedimension, the disordered phase disappears above. Since in solids the properties are governed by collective phenomena, the investigation of the magnon spectrum would provide an access to the basic and core properties of a magnetic solid. Recent experiments and ab initio calculations show that there are multiple ways to modify the strength of the interfacially induced dmi in thin ferromagnetic films with perpendicular magnetic anisotropy. Strong hopping induced dzyaloshinskiimoriya interaction.
Surprising a strong negative dzyaloshinskiimoriya interaction for auconio systems. We have considered the 1d spin12 heisenberg model with added dzyaloshinskii moriya interaction. Iv international workshop dzyaloshinskiimoriya interaction. In onedimension, the disordered phase disappears above a critical value of the easyaxis anisotropy. The first one evaluates the energy change due to the spin twisting by directly calculating the helical spin structure.
Our study provides the experimental connection between the orbital physics and the spinorbitrelated phenomena, such as dmi. Moreover, it is found that the dzyaloshinskii moriya interaction dmi, the key ingredient for the manipulation of chiral spin arrangements. Spinwave analysis of the xxz heisenberg model with. Interfacial dzyaloshinskiimoriya interaction, surface. Dzyaloshinskiimoriya interaction and chiral magnetism in 3d5d zigzag chains. Quantitatively, it is a term in the hamiltonian which can be written as. Understanding the role of the dzyaloshinskii moriya interaction dmi for the formation of helimagnetic order, as well as the emergence of skyrmions in magnetic systems that lack inversion symmetry, has found increasing interest due to the significant potential for novel spin based technologies. Other digital versions may also be available to download e. Spinorbit coupling in optical lattices can give rise to the dzyaloshinskii moriya dm spin interaction which is essential for spin spiral order. Here, using numerical simulations we demonstrate that antiskyrmions can be a stable spin configuration in the presence of anisotropic dzyaloshinskiimoriya interaction. Determination of the dzyaloshinskiimoriya interaction in exchange. A lorentz microscopy study of chiral magnetic textures. Improvement of the interfacial dzyaloshinskii moriya interaction by introducing a ta buffer layer namhui kim,1 dongsoo han,2 jinyong jung,1 jaehun cho,1 juneseo kim,2,a henk j.
A second one corresponds to a counterclockwise helix, representing an excited state. The effect of the dzyaloshinskiimoriya interaction on the stability of the neel phase and the energy gap for the xxz heisenberg model on a ddimensional hypercubic lattice is investigated using the linear spinwave theory. Effect of dzyaloshinskiimoriya interaction on magnetic. Lack of correlation between dzyaloshinskiimoriya interaction and exchange bias. The inclusion of a dzyaloshinskiimoriya shortrange antisymmetric interaction in the heisenberg hamiltonian induces spontaneous magnetization, at nonzero temperatures, in one and two dimensions. Sep 28, 2016 hysteresis of nanocylinders with dzyaloshinskii moriya interaction hysteresis of nanocylinders with dzyaloshinskii moriya interaction the potential for application of magnetic skyrmions in high density storage devices provides a strong drive to investigate and exploit their stability and manipulability. Strong hopping induced dzyaloshinskiimoriya interaction and. The dzyaloshinskiimoriya interaction dmi is well known to favor a chiral rotation of the magnetic moments, which accounts for the emergence of. Pressuretemperature phase diagram of multiferroic ni3v2o8 pdf. View enhanced pdf access article on wiley online library html view download pdf for offline viewing. Mar 29, 2018 the interfacial dzyaloshinskiimoriya interaction idmi in asymmetric magnetic multilayer films has displayed increasingly important roles in the modification of domain walls, stabilization of skyrmions, and realization of new topological spin textures such as magnetic radial vortices.
Heisenberg model with added dzyaloshinskiimoria interaction. Search the leading research in optics and photonics applied research from spie journals, conference proceedings and presentations, and ebooks. Dzyaloshinskiimoriya interactions and magnetic texture in. Although some experimental efforts have been recently proposed to quantify these interactions and the underlying physics, it is still far from trivial to address the interfacial dmi. In contrast to conventional assumptions, we show that the dzyaloshinskiimoriya interaction can be of nonrelativistic origin. With the application of a gate voltage, a substantial change in dw velocity up to 50 ms is observed, which is much greater than that observed in previous studies. The dzyaloshinskiimoriya interaction dmi is an antisymmetric exchange interac tion that arises at interfaces between ferromagnets and heavy metals which possess strong spinorbit coupling. Asymmetrical domain wall propagation in bifurcated pma. Superexchange calculation is performed for multiorbital band models with broken inversion symmetry. Correlation of the dzyaloshinskiimoriya interaction with. The values of magnetisatoin saturation msat and exchange stiffness aex were identical for top and bottom layers, but the interfacial dzyaloshinskii moriya strength dind was different for each layer. Multipartite entanglement in an xxz spin chain with.
Sep 21, 2017 recently, skyrmions stabilized by the dzyaloshinskii moriya interaction have been studied extensively. Anatomy of dzyaloshinskiimoriya interaction at copt interfaces. We show that the recent experimental realization of spinorbit coupling in ultracold atomic gases can be used to study different types of spin spiral order and resulting multiferroic effects. The dzyaloshinskii moriya interaction dmi is well known to favor a chiral rotation of the magnetic moments, which accounts for the emergence of the skyrmions. We find that the net dmi increases as the difference between top and bottom co interface quality increases. Stanislas rohart, joao sampaio, jacques miltat, ales hrabec ultrasky. It is shown that quantum fluctuations are reduced by the dzyaloshinskiimoriya interaction. Oxygenmediated superexchange or dzyaloshinskiimoriya interactions result in weak ferromagnetism in oxides. We have mapped the model to an effective model which is known as the 1d xxz in both uniform and staggered magnetic fields. These results can boost the development of janus 2d materials, which are useful in the design of multifunctional spintronic devices.
1642 338 803 405 613 427 477 1501 1139 887 1565 493 733 1278 49 214 165 462 689 1588 1335 449 31 1576 895 696 1219 642 519 968 1563 64 1258 781 151 36 830 591 507 517 1493 922 584