Spin–orbit-driven ferromagnetic resonance

Fang, Dong; Kurebayashi, Hidekazu; Wunderlich, J.; Výborný, Karel; Zârbo, Liviu P.; Campion, R. P.; Casiraghi, Arianna; Gallagher, B. L.; Jungwirth, T.; Ferguson, A. J.

doi:10.1038/nnano.2011.68

Cited by 216 publications

(279 citation statements)

References 25 publications

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“…Upon removing the interfacial Cu layer, we observe that the size of the antidampinglike torque is strongly enhanced and that it correlates with the exchange-bias field associated with the fixed AFM moments at the coupled NiFe/IrMn interface. Our observations point to new physics and functionalities that AFMs can bring to the currently highly active research area of relativistic spin-orbit torques induced by in-plane currents in inversion asymmetric magnetic structures [20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 78%

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Electrical manipulation of ferromagnetic NiFe by antiferromagnetic IrMn

et al. 2015

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We demonstrate that an antiferromagnet can be employed for a highly efficient electrical manipulation of a ferromagnet. In our study, we use an electrical detection technique of the ferromagnetic resonance driven by an in-plane ac current in a NiFe/IrMn bilayer. At room temperature, we observe antidampinglike spin torque acting on the NiFe ferromagnet, generated by an in-plane current driven through the IrMn antiferromagnet. A large enhancement of the torque, characterized by an effective spin-Hall angle exceeding most heavy transition metals, correlates with the presence of the exchange-bias field at the NiFe/IrMn interface. It highlights that, in addition to the strong spin-orbit coupling, the antiferromagnetic order in IrMn governs the observed phenomenon.

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Section: Introductionmentioning

confidence: 78%

“…1(b)]. From the decomposition of the resonance into symmetric and antisymmetric Lorentzians [23], we deduce the out-of-plane and in-plane components of the driving field as…”

Section: Observation Of the Antidamping Torquementioning

confidence: 99%

Electrical manipulation of ferromagnetic NiFe by antiferromagnetic IrMn

et al. 2015

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“…2,3 Beside the conventional spin-transfer torque, the concept of spin-orbit torque in both metallic systems and diluted magnetic semiconductors (DMS) has been studied theoretically and experimentally. [4][5][6][7][8][9] In the presence of a charge current, the spin-orbit coupling produces an effective magnetic field which generates a nonequilibrium spin density that, in turn, exerts a torque on the magnetization. [4][5][6] Several experiments on magnetization switching in strained (Ga,Mn)As have provided strong indications that such a torque can be induced by a Dresselhaus-type spinorbit coupling, achieving critical switching currents as low as 10 6 A/cm 2 .…”

mentioning

confidence: 99%

“…The angular dependencies in spin-orbit torque shall be detectable by techniques such as spin-ferromagnetic resonance (FMR). 9 In Fig. 2, we compare the angular dependence of spin torque (T y ) for both (Ga,Mn)As and (In,Mn)As which are popular materials in experiments and device fabrication.…”

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confidence: 99%

Tailoring spin-orbit torque in diluted magnetic semiconductors

Wang

Doğan

et al. 2013

Applied Physics Letters

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We study the spin orbit torque arising from an intrinsic linear Dresselhaus spin-orbit coupling in a single layer III-V diluted magnetic semiconductor. We investigate the transport properties and spin torque using the linear response theory and we report here : (1) a strong correlation exists between the angular dependence of the torque and the anisotropy of the Fermi surface; (2) the spin orbit torque depends nonlinearly on the exchange coupling. Our findings suggest the possibility to tailor the spin orbit torque magnitude and angular dependence by structural design.Comment: 5 pages, 4 figures. Accepted for publication in Applied Physics Letter

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“…Important examples of the SOC effects include current-driven spin-orbit torques [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21], charge-pumping via magnetization precession [8,[22][23][24][25][26], and the formation of topologically nontrivial skyrmion textures [27][28][29][30][31][32][33][34][35][36][37][38] and chiral domain walls [15,16,[39][40][41], as well as the multiferroic behaviour of chiral magnets [42,43] and the ferroelectricity of magnetic textures [41,44].…”

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confidence: 99%

New Boundary-Driven Twist States in Systems with Broken Spatial Inversion Symmetry

Hals

Everschor-Sitte

2017

Phys. Rev. Lett.

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A full description of a magnetic sample includes a correct treatment of the boundary conditions (BCs). This is in particular important in thin film systems, where even bulk properties might be modified by the properties of the boundary of the sample. We study generic ferromagnets with broken spatial inversion symmetry and derive the general micromagnetic BCs of a system with Dzyaloshinskii-Moriya interaction (DMI). We demonstrate that the BCs require the full tensorial structure of the third-rank DMI tensor and not just the antisymmetric part, which is usually taken into account. Specifically, we study systems with C∞v symmetry and explore the consequences of the DMI. Interestingly, we find that the DMI already in the simplest case of a ferromagnetic thinfilm leads to a purely boundary-driven magnetic twist state at the edges of the sample. The twist state represents a new type of DMI-induced spin structure, which is completely independent of the internal DMI field. We estimate the size of the texture-induced magnetoresistance effect being in the range of that of domain walls.Over the past few years, there has been an increasing interest in magnets where interface-induced phenomena play a major role [1][2][3]. This includes the topics of magnetic heterostructures as well as thin films, where the main effects arise from the sample's boundary. Therefore, a rigorous understanding of the physical boundary conditions (BCs) is needed.The strong spin-orbit coupling (SOC) and broken spatial inversion symmetry of these nanostructures lead to an intricate interplay between spin, charge, and orbital degrees of freedom, which affect the magnetic equilibrium state as well as the current-driven spin phenomena. Important examples of the SOC effects include current-driven spin-orbit torques [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21], charge-pumping via magnetization precession [8,[22][23][24][25][26], and the formation of topologically nontrivial skyrmion textures [27][28][29][30][31][32][33][34][35][36][37][38] and chiral domain walls [15,16,[39][40][41], as well as the multiferroic behaviour of chiral magnets [42,43] and the ferroelectricity of magnetic textures [41,44].The underlying mechanism being responsible for chiral skyrmions and domain walls is the Dzyaloshinskii-Moriya interaction (DMI) [45,46]. The DMI is a relativistic magnetic exchange interaction that originates from broken spatial inversion symmetry. Phenomenologically, the DMI is modeled by a free-energy density term, which is linear in the spatial variations of the magnetization. In its most general form, the term can be written asas discussed for example explicitly in Landau & Lifshitz, Ref.[47].Here, m is a unit vector pointing along the magnetization M = M s m, and D ijk is the DMI tensor, which is linear in the relativistic interactions. The particular form of the DMI tensor is determined by the point group of the system. Here, and in what follows, we use the convention of a summation of repeated indices. To avoid confusion with the...

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Spin–orbit-driven ferromagnetic resonance

Cited by 216 publications

References 25 publications

Electrical manipulation of ferromagnetic NiFe by antiferromagnetic IrMn

Electrical manipulation of ferromagnetic NiFe by antiferromagnetic IrMn

Tailoring spin-orbit torque in diluted magnetic semiconductors

New Boundary-Driven Twist States in Systems with Broken Spatial Inversion Symmetry

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