Effect of the quadratic magnetoelectric coupling and Dzyaloshinski-Moriya interaction on domain walls in hexagonal manganites

2006 ◽  
Vol 73 (2) ◽  
Author(s):  
J. H. Qiu ◽  
Q. Jiang
Keyword(s):  
Domain Walls ◽  
Magnetoelectric Coupling ◽  
Hexagonal Manganites ◽  
Moriya Interaction

The effect of Dzyaloshinskii–Moriya interaction on direct and backward transition between magnetic states of Pt/Co/Ir/Co/Pr synthetic ferrimagnet

2021 ◽  
Vol 6 (3) ◽  
pp. 167-178
Author(s):  
Artem D. Talantsev ◽  
Ekaterina I. Kunitsyna ◽  
Roman B. Morgunov
Keyword(s):  
Thin Layer ◽  
Domain Structure ◽  
Magnetization Reversal ◽  
Domain Walls ◽  
Ferromagnetic Layers ◽  
Magneto Optical Kerr Effect ◽  
Magnetic States ◽  
Fluctuation Fields ◽  
Moriya Interaction ◽  
Effect Technique

In this paper, we present the study of domain structure accompanying interstate transitions in Pt/Co/Ir/Co/Pr synthetic ferrimagnet (SF) of 1.1 nm thick and 0.6 – 1.0 nm thin ferromagnetic Co layers. Variation in the thickness of the thin layer causes noticeable changes in the domain structure and mechanism of magnetization reversal revealed by MOKE (Magneto-Optical Kerr Effect) technique. Magnetization reversal includes coherent rotation of magnetization of the ferromagnetic layers, generation of magnetic nuclei, spreading of domain walls (DW), and development of areas similar with strip domains, dependently on thickness of the thin layer. Inequivalence of the direct and backward transitions between magnetic states of SF with parallel and antiparallel magnetizations was observed in sample with thin layer thicknesses 0.8 nm and 1.0 nm. Asymmetry of the transition between these states is expressed in difference fluctuation fields and shapes of reversal magnetization nucleus contributing to the correspondent forward and backward transitions. We proposed simple model based on asymmetry of Dzyaloshinskii–Moriya interaction. This model explains competition between nucleation and domain wall propagation due to increase/decrease of the DW energy dependently on direction of the spin rotation into the DW in respect to external field.

scholarly journals Intrinsic and extrinsic conduction contributions at nominally neutral domain walls in hexagonal manganites

2020 ◽  
Vol 116 (26) ◽  
pp. 262903
Author(s):  
J. Schultheiß ◽  
J. Schaab ◽  
D. R. Småbråten ◽  
S. H. Skjærvø ◽  
E. Bourret ◽  
...  
Keyword(s):  
Domain Walls ◽  
Hexagonal Manganites

scholarly journals Measuring Ferroelectric Order Parameters at Domain Walls and Vortices in Hexagonal Manganites with Atomic Resolution STEM

2017 ◽  
Vol 23 (S1) ◽  
pp. 1636-1637
Author(s):  
Megan E. Holtz ◽  
Konstantin Shapovalov ◽  
Julia A. Mundy ◽  
Celesta S. Chang ◽  
Dennis Meier ◽  
...  
Keyword(s):  
Domain Walls ◽  
Order Parameters ◽  
Atomic Resolution ◽  
Hexagonal Manganites ◽  
Ferroelectric Order

Microscopic approach to the magnetoelectric coupling in RCrO3

2015 ◽  
Vol 29 (Supplement 1) ◽  
pp. 1550251 ◽  
Author(s):  
A. T. Apostolov ◽  
I. N. Apostolova ◽  
J. M. Wesselinowa
Keyword(s):  
Function Theory ◽  
Weak Ferromagnetism ◽  
Anisotropy Constant ◽  
Magnetoelectric Coupling ◽  
Spin Reorientation ◽  
Microscopic Approach ◽  
Rare Earth Ion ◽  
Multiferroic Properties ◽  
Magnetic Anisotropy Constant ◽  
Moriya Interaction

A microscopic model is proposed to describing the multiferroic properties in [Formula: see text], where [Formula: see text] is the magnetic rare earth ion. Using the Green’s function theory, the weak ferromagnetism and the coercive field are calculated by a balance between the Dzyaloshinskii–Moriya interaction (DMI), the single-ion anisotropy and the exchange interaction. We have discussed the magnetic rotational spin-reorientation (SR) transition between [Formula: see text] and [Formula: see text] phases in [Formula: see text] and the abrupt one between [Formula: see text] and [Formula: see text] in [Formula: see text] calculating the energies in the corresponding phases. The type of the phase transition in [Formula: see text] is determined by the sign of the second magnetic anisotropy constant. In order to investigate the origin of the extraordinary ferroelectricity in [Formula: see text], we have studied the different contributions in the polarization due to the antisymmetric exchange DMI and the magnetostriction arising from the Cr-ordering. It is shown that the polarization is due to the interaction between the magnetic [Formula: see text]- and Cr-ions. The influence of a magnetic field on the polarization and of an electric field on the magnetization are also calculated as an evidence for a strong magnetoelectric coupling in [Formula: see text].

Proposal for quantifying the Dzyaloshinsky–Moriya interaction by domain walls annihilation measurement

2014 ◽  
Vol 53 (10) ◽  
pp. 108001 ◽  
Author(s):  
Ryo Hiramatsu ◽  
Kab-Jin Kim ◽  
Yoshinobu Nakatani ◽  
Takahiro Moriyama ◽  
Teruo Ono
Keyword(s):  
Domain Walls ◽  
Moriya Interaction

scholarly journals Valley-polarized domain wall magnons in 2D ferromagnetic bilayers

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Doried Ghader
Keyword(s):  
Domain Wall ◽  
Domain Walls ◽  
Ballistic Transport ◽  
The Other ◽  
Polarized Electrons ◽  
Technological Field ◽  
Electrostatic Doping ◽  
Layer Stacking ◽  
Theoretical Results ◽  
Moriya Interaction

Abstract Valleytronics is a pioneering technological field relying on the valley degree of freedom to achieve novel electronic functionalities. Topological valley-polarized electrons confined to domain walls in bilayer graphene were extensively studied in view of their potentials in valleytronics. Here, we study the magnonic version of domain wall excitations in 2D honeycomb ferromagnetic bilayers (FBL) with collinear order. In particular, we explore the implications of Dzyaloshinskii-Moriya interaction (DMI) and electrostatic doping (ED) on the existence and characteristics of 1D magnons confined to layer stacking domain walls in FBL. The coexistence of DMI and ED is found to enrich the topology in FBL, yet the corresponding domain wall magnons do not carry a well-defined valley index. On the other hand, we show that layer stacking domain walls in DMI-free FBL constitute 1D channels for ballistic transport of topological valley-polarized magnons. Our theoretical results raise hope towards magnon valleytronic devices based on atomically thin topological magnetic materials.

Visualization of large-scale charged domain Walls in hexagonal manganites

2021 ◽  
Vol 118 (7) ◽  
pp. 072901
Author(s):  
Fei Fan ◽  
Ziyan Gao ◽  
Louis Ponet ◽  
Jing Wang ◽  
Houbing Huang ◽  
...  
Keyword(s):  
Large Scale ◽  
Domain Walls ◽  
Hexagonal Manganites

scholarly journals Domain structure of ultrathin ferromagnetic elements in the presence of Dzyaloshinskii–Moriya interaction

2017 ◽  
Vol 473 (2197) ◽  
pp. 20160666 ◽  
Author(s):  
Cyrill B. Muratov ◽  
Valeriy V. Slastikov
Keyword(s):  
Domain Walls ◽  
Magnetocrystalline Anisotropy ◽  
Energy Functional ◽  
Multilayer Nanostructures ◽  
Interfacial Effects ◽  
One Dimensional ◽  
Modelling Framework ◽  
Lateral Extent ◽  
The One ◽  
Moriya Interaction

Recent advances in nanofabrication make it possible to produce multilayer nanostructures composed of ultrathin film materials with thickness down to a few monolayers of atoms and lateral extent of several tens of nanometers. At these scales, ferromagnetic materials begin to exhibit unusual properties, such as perpendicular magnetocrystalline anisotropy and antisymmetric exchange, also referred to as Dzyaloshinskii–Moriya interaction (DMI), because of the increased importance of interfacial effects. The presence of surface DMI has been demonstrated to fundamentally alter the structure of domain walls. Here we use the micromagnetic modelling framework to analyse the existence and structure of chiral domain walls, viewed as minimizers of a suitable micromagnetic energy functional. We explicitly construct the minimizers in the one-dimensional setting, both for the interior and edge walls, for a broad range of parameters. We then use the methods of Γ -convergence to analyse the asymptotics of the two-dimensional magnetization patterns in samples of large spatial extent in the presence of weak applied magnetic fields.

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