Angle Resolved Relaxation of Spin Currents by Antiferromagnets in Spin Valves

Polishchuk, Dmytro; Kamra, Akashdeep; Polek, T. I.; Brataas, Arne; Korenivski, Vladislav

doi:10.1103/physrevlett.123.247201

Cited by 5 publications

(4 citation statements)

References 45 publications

(64 reference statements)

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“…Temperature-dependent measurements were performed after cooling in a magnetic field applied along the nominal pinning direction. For additional details and examples on sample fabrication and measurement methods used see [29][30][31].…”

Section: Samples and Methodsmentioning

confidence: 99%

Isotropic FMR frequency enhancement in thin Py/FeMn bilayers under strong magnetic proximity effect

Polishchuk¹,

Polek²,

Borynskyi³

et al. 2021

J. Phys. D: Appl. Phys.

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Exchange biasing in ferromagnet/antiferromagnet bilayers is known to enhance the material’s ferromagnetic resonance frequency and make it strongly angle dependent due to the unidirectional anisotropy induced at the interface. We observe a ten-fold enhancement in frequency and angle-independent ferromagnetic resonance in bilayers of Py/FeMn with ultrathin FeMn, accompanied by a significantly enhanced magnetic moment. The observed isotropic frequency enhancement is consistent with rotatable rather than unidirectional magnetic anisotropy and the induced magnetic moment links this anisotropy with the ferromagnet-proximity effect. The estimated effective anisotropy field acting on the proximity-induced moment in ultrathin FeMn can be as high as 0.5 T at room temperature. Our results show the potential of the ferromagnetic proximity effect combined with the inherent exchange anisotropy in antiferromagnets for high-speed spintronic applications.

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Section: Samples and Methodsmentioning

confidence: 99%

Isotropic FMR frequency enhancement in thin Py/FeMn bilayers under strong magnetic proximity effect

Polishchuk¹,

Polek²,

Borynskyi³

et al. 2021

J. Phys. D: Appl. Phys.

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“…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. Although nonlocal anisotropic damping factors related to spin current transmission have been presented (48)(49)(50)(51), the anisotropic ratio is less than 100%. For the NiFe/Cu/L-Co heterostructures investigated here, the chirality-induced nonlocal spin current propagation gives rise to an anisotropy in the Gilbert damping factor that is ~30 times larger (theoretically ~3000%) and displays a maximum damping factor of 0.328 (measured value).…”

Section: Discussionmentioning

confidence: 99%

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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“…In this paper, we report our investigation of spin current pumped into AFM CoO from Fe (driven into FMR) across (permalloy). FMR has been a powerful mechanism for the study of spin pumping because the FM layer at FMR is a high-quality source of spin current that simultaneously serves as a spin-pumping indicator due to FMR linewidth broadening or damping enhancement [12,16,20,[32][33][34][35][36]. In order to avoid experimental artifacts mentioned previously, we designed our sample by considering the following factors.…”

Section: Methodsmentioning

confidence: 99%

“…It is obvious that whether or not there exists a spin current anisotropy is crucial to the understanding of spin current in AFM. Experimental verification of this anisotropic behavior of the spin current in AFM, however, seems to show inconclusive results with some reports supporting anisotropic behavior [12][13][14][15][16][17] and others that are contradictory [18][19][20]. The complexity in identifying the spin-current anisotropy can be traced to two critical experimental issues.…”

Section: Introductionmentioning

confidence: 99%