Magnetic noise in structured hard magnets
The anomalous Hall effect of wires patterned from (Co{90}Fe{10}/Pt){n} multilayers, with 10<or=n<or=50, is used to determine the magnetization process in a small volume of maze domains. Time-independent 1/f noise appears in samples with a quality factor Q<1 at points on the hysteresis loop...
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Published in | Physical review letters Vol. 104; no. 4; p. 047202 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
United States
29.01.2010
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Online Access | Get more information |
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Summary: | The anomalous Hall effect of wires patterned from (Co{90}Fe{10}/Pt){n} multilayers, with 10<or=n<or=50, is used to determine the magnetization process in a small volume of maze domains. Time-independent 1/f noise appears in samples with a quality factor Q<1 at points on the hysteresis loop where the magnetization reverses continuously. The magnetic noise is associated with reversible excursions of segments of a domain wall approximately 100 nm long. Barkhausen jumps are observed close to either the switching field or the saturation field where the noise power spectrum varies as 1/f{1.7}, and its magnitude decays with time. |
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ISSN: | 1079-7114 |
DOI: | 10.1103/PhysRevLett.104.047202 |