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Title: Probing the spin polarization of current by soft x-ray imaging of current-induced magnetic vortex dynamics

Abstract

Time-resolved soft X-ray transmission microscopy is applied to image the current-induced resonant dynamics of the magnetic vortex core realized in a micron-sized Permalloy disk. The high spatial resolution better than 25 nm enables us to observe the resonant motion of the vortex core. The result also provides the spin polarization of the current to be 0.67 {+-} 0.16 for Permalloy by fitting the experimental results with an analytical model in the framework of the spin-transfer torque.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
Materials Sciences Division
OSTI Identifier:
946301
Report Number(s):
LBNL-1383E
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US200903%%358
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Name: Physical Review Letters; Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MICROSCOPY; PERMALLOY; POLARIZATION; SPATIAL RESOLUTION; SPIN; TORQUE

Citation Formats

Kasai, Shinya, Fischer, Peter, Im, Mi-Young, Yamada, Keisuke, Nakatani, Yoshinobu, Kobayashi, Kensuke, Kohno, Hiroshi, and Ono, Teruo. Probing the spin polarization of current by soft x-ray imaging of current-induced magnetic vortex dynamics. United States: N. p., 2008. Web. doi:10.1103/PhysRevLett.101.237203.
Kasai, Shinya, Fischer, Peter, Im, Mi-Young, Yamada, Keisuke, Nakatani, Yoshinobu, Kobayashi, Kensuke, Kohno, Hiroshi, & Ono, Teruo. Probing the spin polarization of current by soft x-ray imaging of current-induced magnetic vortex dynamics. United States. https://doi.org/10.1103/PhysRevLett.101.237203
Kasai, Shinya, Fischer, Peter, Im, Mi-Young, Yamada, Keisuke, Nakatani, Yoshinobu, Kobayashi, Kensuke, Kohno, Hiroshi, and Ono, Teruo. Tue . "Probing the spin polarization of current by soft x-ray imaging of current-induced magnetic vortex dynamics". United States. https://doi.org/10.1103/PhysRevLett.101.237203. https://www.osti.gov/servlets/purl/946301.
@article{osti_946301,
title = {Probing the spin polarization of current by soft x-ray imaging of current-induced magnetic vortex dynamics},
author = {Kasai, Shinya and Fischer, Peter and Im, Mi-Young and Yamada, Keisuke and Nakatani, Yoshinobu and Kobayashi, Kensuke and Kohno, Hiroshi and Ono, Teruo},
abstractNote = {Time-resolved soft X-ray transmission microscopy is applied to image the current-induced resonant dynamics of the magnetic vortex core realized in a micron-sized Permalloy disk. The high spatial resolution better than 25 nm enables us to observe the resonant motion of the vortex core. The result also provides the spin polarization of the current to be 0.67 {+-} 0.16 for Permalloy by fitting the experimental results with an analytical model in the framework of the spin-transfer torque.},
doi = {10.1103/PhysRevLett.101.237203},
url = {https://www.osti.gov/biblio/946301}, journal = {Physical Review Letters},
issn = {0031-9007},
number = ,
volume = ,
place = {United States},
year = {2008},
month = {12}
}