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Proceedings Paper

Unidirectional response in spin-torque driven magnetization dynamics
Author(s): J. Sklenar; W. Zhang; M. B. Jungfleisch; A. Hoffmann
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Paper Abstract

It was recently demonstrated in bilayers of permalloy and platinum, that by combining spin torques arising from the spin Hall effect with Oersted field-like torques, magnetization dynamics can be induced with a directional preference.1 This “unidirectional” magnetization dynamic effect is made possible by exploiting the different even and odd symmetry that damping-like and field-like torques respectively have when magnetization is reversed. The experimental method used to demonstrate this effect was the spin-torque ferromagnetic (ST-FMR) resonance technique; a popular tool used in the phenomenological quantification of a myriad of damping-like and field-like torques. In this report, we review the phenomenology which is used to describe and analyze the unidirectional magnetization dynamic effect in ST-FMR measurements. We will focus on how the asymmetry in the dynamics also is present in the phase angle of the magnetization precession. We conclude by demonstrating a utility of this directional effect; we will outline an improved experimental method that can be used to distinguish a phase-shifted field-like torque in a ST-FMR experiment from a combination of field-like and damping-like torques.

Paper Details

Date Published: 20 September 2018
PDF: 10 pages
Proc. SPIE 10732, Spintronics XI, 1073212 (20 September 2018); doi: 10.1117/12.2321259
Show Author Affiliations
J. Sklenar, Univ. of Illinois at Urbana-Champaign (United States)
W. Zhang, Oakland Univ. (United States)
Argonne National Lab. (United States)
M. B. Jungfleisch, Univ. of Delaware (United States)
Argonne National Lab. (United States)
A. Hoffmann, Argonne National Lab. (United States)

Published in SPIE Proceedings Vol. 10732:
Spintronics XI
Henri-Jean Drouhin; Jean-Eric Wegrowe; Manijeh Razeghi; Henri Jaffrès, Editor(s)

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