Direct observation of spin diffusion enhanced nonadiabatic spin torque effects in rare-earth-doped permalloy

Krautscheid P, Reeve RM, Schoenke D, Boventer I, Conca A, Chumak A, Hillebrands B, Ehrler J, Osten J, Fassbender J, Klaeui M (2018)

Publication Type: Journal article

Publication year: 2018

Journal

Physical Review B American Physical Society

Book Volume: 98

Article Number: 214406

Journal Issue: 21

DOI: 10.1103/PhysRevB.98.214406

Abstract

The relation between the nonadiabaticity parameter β and the damping parameter α is investigated in permalloy-based microdisks. In order to determine β, high-resolution imaging of the current-induced vortex-core displacement is performed using scanning electron microscopy with polarization analysis. The materials properties of the films are varied via rare-earth Dy doping, leading to a greatly enhanced damping, while retaining the same spin configuration for the confined vortex state. A clear trend to much higher nonadiabaticity values is seen for the higher doping levels and an averaged value of β=(0.29±0.15)×10-2 is determined for 1.73% Dy doping, compared to (0.067±0.014)×10-2 which is extracted for pure permalloy. This is supportive of a similar scaling of β and α in this system, pointing to a common origin of the spin relaxation which is at the heart of nonadiabatic transport and the dissipation of angular momentum that provides damping, in line with theoretical calculations.

Involved external institutions

Johannes Gutenberg-Universität Mainz (JGU) DE Germany (DE) Technische Universität Kaiserslautern DE Germany (DE) Helmholtz-Zentrum Dresden-Rossendorf (HZDR) DE Germany (DE)

How to cite

APA:

Krautscheid, P., Reeve, R.M., Schoenke, D., Boventer, I., Conca, A., Chumak, A.,... Klaeui, M. (2018). Direct observation of spin diffusion enhanced nonadiabatic spin torque effects in rare-earth-doped permalloy. Physical Review B, 98(21). https://doi.org/10.1103/PhysRevB.98.214406

MLA:

Krautscheid, Pascal, et al. "Direct observation of spin diffusion enhanced nonadiabatic spin torque effects in rare-earth-doped permalloy." Physical Review B 98.21 (2018).

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