Engineering Curvature-Induced Anisotropy in Thin Ferromagnetic Films

Tretiakov, Oleg A.; Morini, Massimiliano; Vasylkevych, Sergiy; Slastikov, Valeriy

doi:10.1103/physrevlett.119.077203

Cited by 32 publications

(24 citation statements)

References 35 publications

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“…Accessing spin textures of geometrically curved magnetic thin films 39 , 41 – 44 , hollow cylinders 37 , 40 , 45 – 50 and wires 35 , 51 – 54 has become now a dynamic research field 23 , 55 . In our work, we performed a detailed study of the interplay between the intrinsic and extrinsic chiral interactions of 3D curvilinear objects within a 1D anisotropic Heisenberg magnet with intrinsic DMI.…”

Section: Introductionmentioning

confidence: 99%

Mesoscale Dzyaloshinskii-Moriya interaction: geometrical tailoring of the magnetochirality

Volkov

Sheka

Gaididei

et al. 2018

Sci Rep

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Crystals with broken inversion symmetry can host fundamentally appealing and technologically relevant periodical or localized chiral magnetic textures. The type of the texture as well as its magnetochiral properties are determined by the intrinsic Dzyaloshinskii-Moriya interaction (DMI), which is a material property and can hardly be changed. Here we put forth a method to create new artificial chiral nanoscale objects with tunable magnetochiral properties from standard magnetic materials by using geometrical manipulations. We introduce a mesoscale Dzyaloshinskii-Moriya interaction that combines the intrinsic spin-orbit and extrinsic curvature-driven DMI terms and depends both on the material and geometrical parameters. The vector of the mesoscale DMI determines magnetochiral properties of any curved magnetic system with broken inversion symmetry. The strength and orientation of this vector can be changed by properly choosing the geometry. For a specific example of nanosized magnetic helix, the same material system with different geometrical parameters can acquire one of three zero-temperature magnetic phases, namely, phase with a quasitangential magnetization state, phase with a periodical state and one intermediate phase with a periodical domain wall state. Our approach paves the way towards the realization of a new class of nanoscale spintronic and spinorbitronic devices with the geometrically tunable magnetochirality.

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Section: Introductionmentioning

confidence: 99%

Mesoscale Dzyaloshinskii-Moriya interaction: geometrical tailoring of the magnetochirality

Volkov

Sheka

Gaididei

et al. 2018

Sci Rep

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show abstract

“…[32] Recent research has shown that by engineering the surface, perpendicular or other types of magnetic anisotropy can be achieved in ultrathin magnetic films. [33] In our phase change heterostructure, the lattice variation in the specific plane is quite large, which could lead to some periodic bending and spin reorientation of the NiFe film at the interface. [34] Assuming that it mainly affects the domain wall motion, the mechanism can be understood through a strain-induced anisotropy change.…”

Section: Strain Analysis and Mechanism Explanationmentioning

confidence: 92%

“…Based on the understanding that the magnetism modulation is mainly due to the interfacial strain, we then focus on the origin of the magnetism modulation caused by interfacial strain during the phase change . Recent research has shown that by engineering the surface, perpendicular or other types of magnetic anisotropy can be achieved in ultrathin magnetic films . In our phase change heterostructure, the lattice variation in the specific plane is quite large, which could lead to some periodic bending and spin reorientation of the NiFe film at the interface .…”

Section: Strain Analysis and Mechanism Explanationmentioning

confidence: 99%

Optically Induced Phase Change for Magnetoresistance Modulation

Wei

Lin

et al. 2020

Adv Quantum Tech

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Optical methods for magnetism manipulation have been considered as a promising strategy for ultralow‐power and ultrahigh‐speed data storage and processing, which have become an emerging field of spintronics. However, a widely applicable and efficient method has rarely been demonstrated. Here, the strongly correlated electron material vanadium dioxide (VO2) is used to realize the optically induced phase change for control of the magnetism in NiFe. The NiFe/VO2 bilayer heterostructure features appreciable modulations of electrical conductivity (32%), coercivity (37.5%), and magnetic anisotropy (25%). Further analyses indicate that interfacial strain coupling plays a crucial role in the magnetic modulation. Utilizing this heterostructure, which can respond to both optical and magnetic stimuli, a phase change controlled anisotropic magnetoresistance (AMR) device is fabricated, and reconfigurable Boolean logics are implemented. As a demonstration of phase change spintronics, this work may pave the way for next‐generation opto‐electronics in the post‐Moore era.

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“…[ 64,65 ] The magnetic moments on curved surfaces defined by simple smooth functions f ( x,y ) can produce a magnetic anisotropy axis along any direction because of the long range dipolar interaction. [ 66,67 ] This global surface anisotropy arising from periodic topography can compensate the fluctuation of magnetizations. Confinement along the normal direction of a curved space usually changes the equation of motion of the particles, leads to the quantization of the electronic states, and may induce a curvature‐controllable geometric potentials, which is related to mean curvature and Gaussian curvature.…”

Section: Low Dimensional Theory For Magnetizationmentioning

confidence: 99%

Prospects and Opportunities of 2D van der Waals Magnetic Systems

et al. 2020

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The existence of spontaneous magnetization in low dimensional magnetic systems has attracted intensive studies since the early 60s and research remains very active even now. Only recently, magnetic van der Waals (vdW) systems down to a few layers have been broadly discussed for their magnetic order ground states at finite temperature. The naturally inherited layered structure of the vdW magnetic systems possessing onsite magnetic anisotropy from band electrons can suppress the long-range fluctuations. This provides an excellent vehicle to study the transition of magnetism to 2D limits both theoretically and experimentally. Here the current status of 2D vdW magnetic system and its potential applications are briefly summarized and discussed.

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Engineering Curvature-Induced Anisotropy in Thin Ferromagnetic Films

Cited by 32 publications

References 35 publications

Mesoscale Dzyaloshinskii-Moriya interaction: geometrical tailoring of the magnetochirality

Mesoscale Dzyaloshinskii-Moriya interaction: geometrical tailoring of the magnetochirality

Optically Induced Phase Change for Magnetoresistance Modulation

Prospects and Opportunities of 2D van der Waals Magnetic Systems

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