High-coercivity, c-axis oriented Nd2Fe14B films grown by molecular beam epitaxy

被引:50
作者
Keavney, DJ
Fullerton, EE
Pearson, JE
Bader, SD
机构
[1] Materials Science Division, Agronne National Laboratory, Argonne
关键词
D O I
10.1063/1.364969
中图分类号
O59 [应用物理学];
学科分类号
摘要
Thin films of Nd2Fe14B with a c-axis orientation and bulklike magnetic properties have been grown via molecular beam epitaxy with thicknesses as low as 300 Angstrom. The films are grown on single-crystal MgO(100) wafers overcoated with epitaxial Mo(100) buffer layers. The 2-14-1 phase is crystallized either by sequential deposition or codeposition of Fe, Nd, and B from pure elemental evaporation sources onto 600-700 degrees C substrates. The structure of each film was characterized in situ with reflection high-energy electron diffraction and ex situ with x-ray diffraction. For the sequentially deposited films, the in-plane saturation field is 60-70 kOe at 300 K, consistent with the bulk anisotropy field of 73 kOe. The spin-reorientation transition at 135 K can also be clearly seen in the in-plane and out-of-plane magnetization versus temperature data. The out-of-plane coercivities typically range from 15 to 20 kOe at 20 K, and from 3 to 8 kOe at 300 K. Codeposition results in a multiphase structure, with Nd2Fe14B show the minority phase. The multiphase structure results in reduced perpendicular anisotropy. (C) 1997 American Institute of Physics.
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页码:4441 / 4443
页数:3
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