TY - JOUR
T1 - Permanent-magnet properties of thermally processed FePt and FePt-Fe multilayer films
AU - Zhou, Jian
AU - Skomski, Ralph
AU - Li, Xingzhong
AU - Tang, Wei
AU - Hadjipanayis, George C.
AU - Sellmyer, David J.
N1 - Funding Information:
Manuscript received February 14, 2001. This work was supported by the Department of Energy, by the Air Force Office of Scientific Research, and CMRA.
PY - 2002/9
Y1 - 2002/9
N2 - FePt single-layer and FePt-Fe multilayer thin films are prepared by magnetron sputtering. By varying the Pt content, FePt, Fe3 Pt, or a mixture of FePt and Fe3 Pt can be obtained in Fe-Pt single layers. In annealed FePt-Fe multilayers, the coercivities decrease with the introduction of Fe layers compared to FePt single layers, while the magnetization increases. The single-phase behavior of the hysteresis loops of FePt-Fe multilayers indicates the existence of exchange coupling in these materials. For one FePt-Fe sample with optimized exchange coupling, the intrinsic properties correspond to an energy product of 19 MGOe. The texture of the magnets is determined by the (111) orientation of the crystallites. This means that the easy magnetization directions of the FePt grains form an angle of 54.7° with the film normal, but are randomly oriented in the film plane. It is analyzed how this easy-axis distribution affects the magnetic hysteresis.
AB - FePt single-layer and FePt-Fe multilayer thin films are prepared by magnetron sputtering. By varying the Pt content, FePt, Fe3 Pt, or a mixture of FePt and Fe3 Pt can be obtained in Fe-Pt single layers. In annealed FePt-Fe multilayers, the coercivities decrease with the introduction of Fe layers compared to FePt single layers, while the magnetization increases. The single-phase behavior of the hysteresis loops of FePt-Fe multilayers indicates the existence of exchange coupling in these materials. For one FePt-Fe sample with optimized exchange coupling, the intrinsic properties correspond to an energy product of 19 MGOe. The texture of the magnets is determined by the (111) orientation of the crystallites. This means that the easy magnetization directions of the FePt grains form an angle of 54.7° with the film normal, but are randomly oriented in the film plane. It is analyzed how this easy-axis distribution affects the magnetic hysteresis.
KW - Annealing
KW - Permanent magnets
KW - Pt-Fe
KW - Texture
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U2 - 10.1109/TMAG.2002.803109
DO - 10.1109/TMAG.2002.803109
M3 - Conference article
AN - SCOPUS:0036762008
SN - 0018-9464
VL - 38
SP - 2802
EP - 2804
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
IS - 5 I
T2 - 2002 International Magnetics Conference (Intermag 2002)
Y2 - 28 April 2002 through 2 May 2002
ER -