Curie temperatures of fcc and bcc nickel and permalloy: Supercell and Green’s function methods

P. Yu and X. F. Jin*,†

Surface Physics Laboratory, Fudan University, Shanghai 200433, China

J. Kudrnovský‡

Institute of Physics, Academy of Sciences of the Czech Republic, CZ-180 40 Praha 8, Czech Republic


D. S. Wang

Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China

P. Bruno

Institut für Mikrostrukturphysik, Max-Planck Institut, Weinberg 2, D-06120 Halle, Germany

Received 4 January 2007; revised manuscript received 3 January 2008; published 25 February 2008

Abstract

The finite-temperature magnetism of Ni and permalloy in body-centered-cubic bcc and face-centered-cubic fcc phases is studied theoretically using ab initio supercell calculations and Green’s function methods. The results confirm and explain the general experimental trend that the fcc phases have higher Curie temperatures than the bcc counterparts. In addition, the spin-wave stiffness constants of bcc-Ni and bcc-permalloy are predicted.

http://www.physics.fudan.edu.cn/tps/people/xfjin/pdf/yuping_2008.pdf