Sensitive detection of irreversible switching in a single FePt nanosized dot

Magnetization of an isolated single dot as small as 60 nm in diameter fabricated from a single crystal L10-FePt(001) film has been measured by detection of the anomalous Hall effect in the temperature range from 10 to 300 K. Over the whole temperature range, the dots with diameter ranging from 60 nm...

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Bibliographic Details
Published in:Applied physics letters 2003-06, Vol.82 (24), p.4313-4315
Main Authors: Kikuchi, N., Okamoto, S., Kitakami, O., Shimada, Y., Fukamichi, K.
Format: Article
Language:English
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Summary:Magnetization of an isolated single dot as small as 60 nm in diameter fabricated from a single crystal L10-FePt(001) film has been measured by detection of the anomalous Hall effect in the temperature range from 10 to 300 K. Over the whole temperature range, the dots with diameter ranging from 60 nm to 12 μm exhibit perfect rectangular magnetization loops with coercivity almost constant regardless of the very large difference in diameter. The activation energy has been evaluated to be about 4×10−19 J, equivalent to the domain-wall energy times the square of the domain-wall thickness, suggesting that the magnetization reversals are initiated by nucleation of reversed embryo with the dimension of the exchange length.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1580994