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Proceedings Paper

Near-field microwave phase imaging by a spintronic sensor
Author(s): XiaoFeng Zhu; M. Harder; A. Wirthmann; Bo Zhang; W. Lu; Y. S. Gui; C.-M. Hu
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Paper Abstract

We report a novel technique for microwave imaging utilizing a nonlinear coupling between the microwave fields in a ferromagnetic material, in which the relative phase of the coupled microwave fields plays an important role in the resultant homodyne dc voltage. A technical breakthrough has been achieved to effectively control such a relative phase using a spintronic Michelson interferometry. This enables a phase- and amplitude-resolved near-field dielectric image using a spintronic sensor. The contrast of microwave imaging for an object with subwavelength features strongly depends on the local dielectric constant of materials, and agrees well with simulation results by COMSOL.

Paper Details

Date Published: 18 February 2011
PDF: 6 pages
Proc. SPIE 7995, Seventh International Conference on Thin Film Physics and Applications, 79951X (18 February 2011); doi: 10.1117/12.888266
Show Author Affiliations
XiaoFeng Zhu, Shanghai Institute of Technical Physics (China)
Univ. of Manitoba (Canada)
M. Harder, Univ. of Manitoba (Canada)
A. Wirthmann, Univ. of Manitoba (Canada)
Bo Zhang, Shanghai Institute of Technical Physics (China)
W. Lu, Shanghai Institute of Technical Physics (China)
Y. S. Gui, Univ. of Manitoba (Canada)
C.-M. Hu, Univ. of Manitoba (Canada)

Published in SPIE Proceedings Vol. 7995:
Seventh International Conference on Thin Film Physics and Applications
Junhao Chu; Zhanshan Wang, Editor(s)

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