Experimental realization of linearly polarized x-ray detected ferromagnetic resonance

C Klewe; S Emori; Q Li; M Yang; B A Gray; H-M Jeon; B M Howe; Y Suzuki; Z Q Qiu; P Shafer; E Arenholz

doi:10.1088/1367-2630/ac465f

New Journal of Physics (Jan 2022)

Experimental realization of linearly polarized x-ray detected ferromagnetic resonance

C Klewe,
S Emori,
Q Li,
M Yang,
B A Gray,
H-M Jeon,
B M Howe,
Y Suzuki,
Z Q Qiu,
P Shafer,
E Arenholz

Affiliations

C Klewe: ORCiD; Advanced Light Source, Lawrence Berkeley National Laboratory , Berkeley, CA, United States of America
S Emori: Department of Physics, Virginia Tech , Blacksburg, VA, United States of America
Q Li: National Synchrotron Radiation Laboratory, University of Science and Technology of China , Hefei, Anhui, People’s Republic of China
M Yang: Institute of Physical Science and Information Technology, Anhui University , Hefei, Anhui, People’s Republic of China
B A Gray: Materials and Manufacturing Directorate, Air Force Research Laboratory , Wright-Patterson Air Force Base, OH, United States of America
H-M Jeon: Sensors Directorate, Air Force Research Laboratory , Wright-Patterson Air Force Base, OH, United States of America
B M Howe: Materials and Manufacturing Directorate, Air Force Research Laboratory , Wright-Patterson Air Force Base, OH, United States of America
Y Suzuki: Geballe Laboratory for Advanced Materials, Stanford University , Stanford, CA, United States of America; Department of Applied Physics, Stanford University , Stanford, CA, United States of America
Z Q Qiu: Department of Physics, University of California at Berkeley , Berkeley, CA, United States of America
P Shafer: ORCiD; Advanced Light Source, Lawrence Berkeley National Laboratory , Berkeley, CA, United States of America
E Arenholz: Advanced Light Source, Lawrence Berkeley National Laboratory , Berkeley, CA, United States of America

DOI: https://doi.org/10.1088/1367-2630/ac465f
Journal volume & issue: Vol. 24, no. 1
p. 013030

Abstract

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We present the first theoretical and experimental evidence of time-resolved dynamic x-ray magnetic linear dichroism (XMLD) measurements of GHz magnetic precessions driven by ferromagnetic resonance in both metallic and insulating thin films. Our findings show a dynamic XMLD in both ferromagnetic Ni _80 Fe _20 and ferrimagnetic Ni _0.65 Zn _0.35 Al _0.8 Fe _1.2 O _4 for different measurement geometries and linear polarizations. A detailed analysis of the observed signals reveals the importance of separating different harmonic components in the dynamic signal in order to identify the XMLD response without the influence of competing contributions. In particular, RF magnetic resonance elicits a large dynamic XMLD response at the fundamental frequency under experimental geometries with oblique x-ray polarization. The geometric range and experimental sensitivity can be improved by isolating the 2 ω Fourier component of the dynamic response. These results illustrate the potential of dynamic XMLD and represent a milestone accomplishment toward the study of GHz spin dynamics in systems beyond ferromagnetic order.

Published in New Journal of Physics

ISSN: 1367-2630 (Online)
Publisher: IOP Publishing
Country of publisher: United Kingdom
LCC subjects: Science: Physics
Website: https://iopscience.iop.org/journal/1367-2630

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