Interfacial Tuning of Anisotropic Gilbert Damping

Chen, Lin; Mankovsky, S.; Kronseder, M.; Schuh, Dieter; Prager, M.; Bougeard, Dominique; Ebert, H.; Weiss, Dieter; Back, Christian

doi:10.1103/physrevlett.130.046704

Cited by 7 publications

(2 citation statements)

References 52 publications

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“…The observed colossal anisotropy of spin current absorption in the chiral NiFe/Cu/L-Co heterostructures is unprecedented and sharply contrasts the expected response for a magnetic multilayer system ( 43 – 46 ). In previous reports, anisotropic damping factors have been shown to arise from interfacial SOC effects or bulk crystalline anisotropy ( 12 – 14 , 47 ), and the anisotropic damping factor has reached values as high as ~400 to 650% for single-crystal CoFeB(001) films, with a maximum damping factor of ~0.03 ( 13 , 14 ). However, such an anisotropic damping in CoFeB films results from the magnetic layer itself, i.e., the intrinsic damping factor of the local magnetic moment, not from nonlocal spin current transmission.…”

Section: Discussionmentioning

confidence: 95%

Colossal anisotropic absorption of spin currents induced by chirality

Sun,

Wang,

Bloom

et al. 2024

Sci. Adv.

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The chiral induced spin selectivity (CISS) effect, in which the structural chirality of a material determines the preference for the transmission of electrons with one spin orientation over that of the other, is emerging as a design principle for creating next-generation spintronic devices. CISS implies that the spin preference of chiral structures persists upon injection of pure spin currents and can act as a spin analyzer without the need for a ferromagnet. Here, we report an anomalous spin current absorption in chiral metal oxides that manifests a colossal anisotropic nonlocal Gilbert damping with a maximum-to-minimum ratio of up to 1000%. A twofold symmetry of the damping is shown to result from differential spin transmission and backscattering that arise from chirality-induced spin splitting along the chiral axis. These studies reveal the rich interplay of chirality and spin dynamics and identify how chiral materials can be implemented to direct the transport of spin current.

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Section: Discussionmentioning

confidence: 95%

Colossal anisotropic absorption of spin currents induced by chirality

Sun,

Wang,

Bloom

et al. 2024

Sci. Adv.

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“…The ultra-thin Fe films grown on GaAs (001) substrates allow us to investigate the expected modification of the magnetic properties for two reasons: Fe/GaAs (001) shows I) very low Gilbert damping values  in the sub-nanometer thickness regime ( = 0.0076 for tFe = 0.91 nm) 25 , and thus it is possible to detect the magnetization dynamics for ultra-thin samples, II) strong interfacial in-plane uniaxial magnetic anisotropy (UMA), which is advantageous for the detection of the spin current induced modification of magnetic anisotropies. The UMA originates from the anisotropic bonding between Fe and As atoms at the GaAs (001) surface 26 , where <110>orientations are the magnetic easy axes (EA) and <110>-orientations are the magnetic hard axes (HA) (Fig.…”

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confidence: 99%

Spin current control of magnetism

Chen,

Sun,

Mankovsky

et al. 2024

Preprint

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Exploring novel strategies to manipulate the order parameter of magnetic materials by electrical means is of great importance, not only for advancing our understanding of fundamental magnetism, but also for unlocking potential practical applications. A well-established concept to date uses gate voltages to control magnetic properties, such as saturation magnetization, magnetic anisotropies, coercive field, Curie temperature and Gilbert damping, by modulating the charge carrier population within a capacitor structure1-5. Note that the induced carriers are non-spin-polarized, so the control via the electricfield is independent of the direction of the magnetization. Here, we show that the magnetocrystalline anisotropy (MCA) of ultrathin Fe films can be reversibly modified by a spin current generated in Pt by the spin Hall effect. The effect decreases with increasing Fe thickness, indicating that the origin of the modification can be traced back to the interface. Uniquely, the change in MCA due to the spin current depends not only on the polarity of the charge current but also on the direction of magnetization, i.e. the change in MCA has opposite sign when the direction of magnetization is reversed. The control of magnetism by the spin current results from the modified exchange splitting of majority- and minority-spin bands, and differs significantly from the manipulation by gate voltages via a capacitor structure, providing a functionality that was previously unavailable and could be useful in advanced spintronic devices.

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Integrating magnons for quantum information

Jiang,

Lim,

et al. 2023

Applied Physics Letters

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Magnons, the quanta of collective spin excitations in magnetically ordered materials, have distinct properties that make them uniquely appealing for quantum information applications. They can have ultra-small wavelengths down to the nanometer scale even at microwave frequencies. They can provide coupling to a diverse set of other quantum excitations, and their inherently gyrotropic dynamics forms the basis for pronounced nonreciprocities. In this article, we discuss what the current research challenges are for integrating magnetic materials into quantum information systems and provide a perspective on how to address them.

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Interfacial Tuning of Anisotropic Gilbert Damping

Cited by 7 publications

References 52 publications

Colossal anisotropic absorption of spin currents induced by chirality

Colossal anisotropic absorption of spin currents induced by chirality

Spin current control of magnetism

Integrating magnons for quantum information

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