Dynamics of domain walls in weak ferromagnets

Bar’yakhtar, V. G.; Иванов, Б. А.; Chetkin, M. V.

doi:10.1070/pu1985v028n07abeh003871

Cited by 143 publications

(123 citation statements)

References 42 publications

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“…It is known that when the DW velocity reaches values as high as the sound velocities in the medium, the impact of the coupling of the DW with phonons becomes significant, leading to highly nonlinear behaviours of the DW [31]. The maximum value of the DW velocity in AFMs is dictated by the magnon dispersion, and can be as high as of the order of 10 km/sec [31].…”

mentioning

confidence: 99%

“…The maximum value of the DW velocity in AFMs is dictated by the magnon dispersion, and can be as high as of the order of 10 km/sec [31]. We leave for future work the systematic study of the SMF in such nonlinear regimes.…”

mentioning

confidence: 99%

“…Consider a one-dimensional AFM nanowire with magnetic energy density u = −2µ [28,29,31] (see Fig. 1 (a) for the coordinate system).…”

mentioning

confidence: 99%

“…Applying the steady-motion approximation to Eq. (11), the terminal velocity v DW ≡ dq/dt| t=∞ of the DW is obtained as [31] …”

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confidence: 99%

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Electric voltage generation by antiferromagnetic dynamics

2016

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We theoretically demonstrate dc and ac electric voltage generation due to spinmotive forces originating from domain wall motion and magnetic resonance, respectively, in two-sublattice antiferromagnets. Our theory accounts for the canting between the sublattice magnetizations, the nonadiabatic electron spin dynamics, and the Rashba spin-orbit coupling, with the inter-sublattice electron dynamics treated as a perturbation. This work suggests a new way to observe and explore the dynamics of antiferromagnetic textures by electrical means, an important aspect in the emerging field of antiferromagnetic spintronics, where both manipulation and detection of antiferromagnets are needed.Introduction.-In magnetic materials, the exchange interaction between the conduction electron spin and the local magnetization is responsible for a variety of important phenomena. Among the spintronic effects caused by this interaction, spin-transfer torque provides a path to promising information technology by enabling the angular momentum to be transferred between the electrons and magnetization [1,2]. The same interaction can also mediate a transfer of energies between the two channels. Such a transfer is mediated by the spinmotive force (SMF) [3][4][5][6], where magnetic energies stored by the magnetization can be transformed to an electric voltage. Theoretically, the SMF is attributed to a spin-dependent electric field arising due to the exchange interaction [7][8][9][10][11][12][13][14], termed spin electric field. The SMF reflects the temporal and spatial variations of the magnetization, and thus offers a powerful way of probing and exploring the dynamics and nature of various magnetic textures.

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Electric voltage generation by antiferromagnetic dynamics

2016

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“…To illustrate how the reorientation direction can depend on these two parameters, we simulated this mechanism by using simple models for the speed of heating [18] and the temperature-dependent anisotropy [23]. We then solved the equations of motion of the excited system by using the Lagrangian discussed elsewhere [24,25] and calculated the magnetic state of the medium at 3 ns after excitation, as a function of laser pulse fluence and initial sample temperature. The results of the calculations are shown in Fig.…”

Section: Prl 108 157601 (2012) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 99%

New Optical Route to Magnetic State Control

Kida¹

2012

Physics

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Time-resolved magneto-optical imaging of laser-excited rare-earth orthoferrite ðSmPrÞFeO 3 demonstrates that a single 60 fs circularly polarized laser pulse is capable of creating a magnetic domain on a picosecond time scale with a magnetization direction determined by the helicity of light. Depending on the light intensity and sample temperature, pulses of the same helicity can create domains with opposite magnetizations. We argue that this phenomenon relies on a twofold effect of light which (i) instantaneously excites coherent low-amplitude spin precession and (ii) triggers a spin reorientation phase transition. The former dynamically breaks the equivalence between two otherwise degenerate states with opposite magnetizations in the high-temperature phase and thus controls the route of the phase transition.

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Current Induced Domain‐wall Motion in Magnetic Nanowires

Thomas¹,

Parkin²

2007

Handbook of Magnetism and Advanced Magnetic Materials

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Recent research on current‐induced domain‐wall motion in magnetic nanowires is reviewed. The first part of the article is devoted to theoretical models and micromagnetic simulations. We first describe the magnetic structure of head‐to‐head domain walls, and then discuss theories of their interaction with spin‐polarized current. The role of both adiabatic and nonadiabatic spin‐transfer torques is discussed in the framework of an analytical one‐dimensional model and micromagnetic simulations. The second part of the article reviews recent experimental studies. Both field‐driven and current‐driven excitation and manipulation of domain walls is discussed.

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Dynamics of domain walls in weak ferromagnets

Cited by 143 publications

References 42 publications

Electric voltage generation by antiferromagnetic dynamics

Electric voltage generation by antiferromagnetic dynamics

New Optical Route to Magnetic State Control

Current Induced Domain‐wall Motion in Magnetic Nanowires

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