The influence of magnetostatic interactions in exchange-coupled composite particles

0347848 - FZÚ 2011 RIV GB eng J - Journal Article
Vokoun, David - Beleggia, M. - De Graef, M. - Hou, H.C. - Lai, C.H.
The influence of magnetostatic interactions in exchange-coupled composite particles.
Journal of Physics D-Applied Physics. Roč. 43, č. 27 (2010), s. 275001-275007. ISSN 0022-3727. E-ISSN 1361-6463
Institutional research plan: CEZ:AV0Z10100520
Keywords : magnetic recording materials * magnetic multilayers * magnetic thin film * magnetostac interaction * magnetic anisotropy
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 2.105, year: 2010
http://iopscience.iop.org/0022-3727/43/27/275001/

Exchange-coupled composite (ECC) particles are the basic constituents of ECC magnetic recording media. We examine and compare two types of ECC particles: (i) core–shell structures, consisting of a hard-magnetic core and a coaxial soft-magnetic shell and (ii) conventional ECC particles, with a hard-magnetic core topped by a soft cylindrical element. The model we present describes the magnetic response of the two ECC particle types, taking into account all significant magnetic contributions to the energy landscape. Special emphasis is given to the magnetostatic (dipolar) interaction energy. We find that both the switching fields and the zero-field energy barrier depend strongly on the particle geometry. A comparison between the two types reveals that core–shell ECC particles are more effective in switching field reduction, while conventional ECC particles maintain a larger overall figure of merit.
Permanent Link: http://hdl.handle.net/11104/0188530