The anisotropy field of FePt L10 nanoparticles controlled by very thin Pt layer

We have prepared epitaxial FePt L10 (001) nanoparticles covered with Pt [dPt nm]/Ag[(4 - dPt) nm] overlayers. The particles are oblate spheroids approximately 10 nm in diameter and 2 nm in height. The anisotropy field Hk at 0 K, which is evaluated from the temperature dependences of coercivity Hc, d...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2004-03, Vol.16 (12), p.2109-2114
Main Authors: Okamoto, Satoshi, Kitakami, Osamu, Kikuchi, Nobuaki, Miyazaki, Takamichi, Shimada, Yutaka, Chiang, Te-Hsuan
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Magnetic properties and materials
Physics
Studies of specific magnetic materials
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Summary:We have prepared epitaxial FePt L10 (001) nanoparticles covered with Pt [dPt nm]/Ag[(4 - dPt) nm] overlayers. The particles are oblate spheroids approximately 10 nm in diameter and 2 nm in height. The anisotropy field Hk at 0 K, which is evaluated from the temperature dependences of coercivity Hc, decreases from 90 to 60 kOe on increasing the Pt thickness from dPt = 0 to 1.5 nm, while the energy barrier at zero field remains unchanged. The significant reduction of Hk due to the presence of the adjacent Pt layer can be attributed to an enhanced magnetic moment caused by the ferromagnetic polarization of Pt atoms at the interface. This finding suggests an effective method of controlling the switching field of FePt L10 nanoparticles.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/16/12/020