Microwave photovoltage and photoresistance effects in ferromagnetic microstrips

We investigate the dc electric response induced by ferromagnetic resonance in ferromagnetic Permalloy (Ni80Fe20) microstrips. The resulting magnetization precession alters the angle of the magnetization with respect to both dc and rf current. Consequently the time averaged anisotropic magnetoresista...

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Bibliographic Details
Published in:arXiv.org 2008-04
Main Authors: Mecking, N, Gui, Y S, C -M Hu
Format: Article
Language:English
Subjects:
Direct current
Ferromagnetic resonance
Ferromagnetism
Ferrous alloys
Magnetic alloys
Magnetic fields
Magnetization
Magnetoresistance
Magnetoresistivity
Time dependence
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Summary:We investigate the dc electric response induced by ferromagnetic resonance in ferromagnetic Permalloy (Ni80Fe20) microstrips. The resulting magnetization precession alters the angle of the magnetization with respect to both dc and rf current. Consequently the time averaged anisotropic magnetoresistance (AMR) changes (photoresistance). At the same time the time-dependent AMR oscillation rectifies a part of the rf current and induces a dc voltage (photovoltage). A phenomenological approach to magnetoresistance is used to describe the distinct characteristics of the photoresistance and photovoltage with a consistent formalism, which is found in excellent agreement with experiments performed on in-plane magnetized ferromagnetic microstrips. Application of the microwave photovoltage effect for rf magnetic field sensing is discussed.
ISSN:2331-8422
DOI:10.48550/arxiv.0710.1974