Journal
IEEE TRANSACTIONS ON MAGNETICS
Volume 39, Issue 5, Pages 2747-2749Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2003.815587
Keywords
FePt; magnetic domain structure; magnetic hysteresis; patterned media
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The magnetization and magnetic-domain structure of arrays of submicrometer-size circular elements made of Fe50Pt50 films (thickness of 48 nm) have been investigated. A transition from multidomain to single-domain states with perpendicular magnetization (for approximate to40% of particles) was observed as the dot diameter decreased from 550 to 200 mm. All patterned structures have hysteresis curves with a similar overall shape, both for the field applied in and out of the plane of the film. The coercivity and squareness decrease significantly with the dot size. The magnetic behavior of the elements can be explained by the partial phase transformation (face-centered cubic --> face-centered tetragonal) of the initial film, as determined by X-ray diffraction.
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