Current control of magnetic anisotropy via stress in a ferromagnetic metal waveguide

An, Kay Hyeok; Ma, Xin; Pai, Chi‐Feng; Yang, Jusang; Olsson, Kevin; Erskine, J. L.; Ralph, Daniel; Buhrman, R. A.; Li, Xiaoqin

doi:10.1103/physrevb.93.140404

Cited by 7 publications

(4 citation statements)

References 31 publications

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“…One conclusion that can be drawn from Table II is case of the present study. The resulting uniaxial stress produces a magnetic anisotropy field H K which affects spin precession resonance frequencies [37] and also can account for the apparent temperature-dependent shift in the mobility cures shown in Fig. 11.…”

Section: Experimental Evidence For the Simulated Dw Behaviormentioning

confidence: 97%

Spin distributions and dynamics in domain walls guided by soft magnetic nanowire structures

Yang

Erskine

2017

Journal of Magnetism and Magnetic Materials

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Numerical simulations are used to investigate static and dynamic properties of spin distributions within domain walls confined by rectangular cross section Permalloy nanowire conduits having widths up to 1000 nm and thickness up to 50 nm. Phase boundaries and critical regions associated with domain-wall spin distributions of various topologies [transverse(or asymmetric transverse), vortex, double-vortex, triple-vortex and cross-tie] are accurately determined using high-performance computing resources. Mobility curves are calculated that characterize domain-wall propagation for an interesting region of the spin texture phase diagram: 20 nm thick nanowires with widths of 60-700 nm at axial drive fields extending to 150 Oe. The simulations (and corresponding experiments, which are discussed), reveal new propagating fixed configuration domain-wall topologies with enhanced velocity. Effects of temperature on the spin distributions and dynamics are explored, by conducting simulations that include separately varying temperaturedependent parameter (saturation magnetization and exchange constant) and simulating effects of temperature-dependent fluctuations using the Langevin dynamics feature of the simulation code. Related temperature-dependent experiments are discussed. The simulation studies demonstrate a close connection between static and (field-driven) dynamic spin configurations in nanowire-confined domain walls and demonstrate the importance of exploring model-system parameter space at high numerical precision.

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Section: Experimental Evidence For the Simulated Dw Behaviormentioning

confidence: 97%

Spin distributions and dynamics in domain walls guided by soft magnetic nanowire structures

Yang

Erskine

2017

Journal of Magnetism and Magnetic Materials

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“…Namely, the magnitude of the PMA should be inversely proportional to the amplitude of the current in the microcoil. Besides, the PMA may also be affected by a thermal stress, 42 which could be caused by the thermal expansion of the sample due to the heating effect. In Supporting Information Note 1, we show experimental evidence that the variation of the PMA is dominated by thermalization, while the effect of stress is not significant compared to that induced by the thermal effect.…”

Section: T H Imentioning

confidence: 99%

Reversible Transformation between Isolated Skyrmions and Bimerons

et al. 2022

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Skyrmions and bimerons are versatile topological spin textures that can be used as information bits for both classical and quantum computing. The transformation between isolated skyrmions and bimerons is an essential operation for computing architecture based on multiple different topological bits. Here we report the creation of isolated skyrmions and their subsequent transformation to bimerons by harnessing the electric currentinduced Oersted field and temperature-induced perpendicular magnetic anisotropy variation. The transformation between skyrmions and bimerons is reversible, which is controlled by the current amplitude and scanning direction. Both skyrmions and bimerons can be created in the same system through the skyrmion-bimeron transformation and magnetization switching. Deformed skyrmion bubbles and chiral labyrinth domains are found as nontrivial intermediate transition states. Our results may provide a unique way for building advanced information-processing devices using different types of topological spin textures in the same system.

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“…The misfit strains u xx and u yy are expected to be fully relaxed at the growth temperature T g = 573 K, which is well above the Curie temperature T C = 393 K of BaTiO 3 . On cooling from T g , nonzero strains appear in the film owing to the difference in the thermal expansion coefficients of paraelectric BaTiO 3 , α 0 = 10 × 10 6 K −1 [42], and Co 40 Fe 40 B 20 , α b = 12 × 10 6 K −1 [43]. Taking into account the fact that spontaneous strains appear in BaTiO 3 below T C , we obtain…”

Section: A Magnetic Anisotropy Of the Co 40 Fe 40 B 20 /Batio 3 Hetementioning

confidence: 99%

Laser-Induced Magnetization Precession in Individual Magnetoelastic Domains of a Multiferroic Co40Fe40B20/BaTiO

et al. 2020

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Using a magneto-optical pump-probe technique with micrometer spatial resolution, we show that magnetization precession can be launched in individual magnetic domains imprinted in a Co 40 Fe 40 B 20 layer by elastic coupling to ferroelectric domains in a BaTiO 3 substrate. The dependence of the precession parameters on the strength and orientation of the external magnetic field reveals that laser-induced ultrafast partial quenching of the magnetoelastic coupling parameter of Co 40 Fe 40 B 20 by approximately 27% along with 10% ultrafast demagnetization triggers the magnetization precession. The relation between the laser-induced reduction of the magnetoelastic coupling and the demagnetization is approximated by an n(n + 1)/2 law with n ≈ 2. This correspondence confirms the thermal origin of the laser-induced anisotropy change. Based on analysis and modeling of the excited precession, we find signatures of laser-induced precessional switching, which occurs when the magnetic field is applied along the hard magnetization axis and its value is close to the effective magnetoelastic anisotropy field. The precessionexcitation process in an individual magnetoelastic domain is found to be unaffected by neighboring domains. This makes laser-induced changes of magnetoelastic anisotropy a promising tool for driving magnetization dynamics and switching in composite multiferroics with spatial selectivity.

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Current control of magnetic anisotropy via stress in a ferromagnetic metal waveguide

Cited by 7 publications

References 31 publications

Spin distributions and dynamics in domain walls guided by soft magnetic nanowire structures

Spin distributions and dynamics in domain walls guided by soft magnetic nanowire structures

Reversible Transformation between Isolated Skyrmions and Bimerons

Laser-Induced Magnetization Precession in Individual Magnetoelastic Domains of a Multiferroic Co40Fe40B20/BaTiO

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