Direct measurement of intrinsic atomic scale magnetostriction


Autoria(s): RUFFONI, M. P.; PASCARELLI, S.; GROESSINGER, R.; TURTELLI, R. Sato; BORMIO-NUNES, C.; PETTIFER, R. F.
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

17/04/2012

17/04/2012

2008

Resumo

Using differential x-ray absorption spectroscopy (DiffXAS) we have measured and quantified the intrinsic, atomic-scale magnetostriction of Fe(81)Ga(19). By exploiting the chemical selectivity of DiffXAS, the Fe and Ga local environments have been assessed individually. The enhanced magnetostriction induced by the addition of Ga to Fe was found to originate from the Ga environment, where lambda(gamma,2)(approximate to (3/2)lambda(100)) is 390 +/- 40 ppm. In this environment, < 001 > Ga-Ga pair defects were found to exist, which mediate the magnetostriction by inducing large strains in the surrounding Ga-Fe bonds. For the first time, intrinsic, chemically selective magnetostrictive strain has been measured and quantified at the atomic level, allowing true comparison with theory.

Identificador

PHYSICAL REVIEW LETTERS, v.101, n.14, 2008

0031-9007

http://producao.usp.br/handle/BDPI/14622

10.1103/PhysRevLett.101.147202

http://dx.doi.org/10.1103/PhysRevLett.101.147202

Idioma(s)

eng

Publicador

AMER PHYSICAL SOC

Relação

Physical Review Letters

Direitos

restrictedAccess

Copyright AMER PHYSICAL SOC

Palavras-Chave #FE-GA #ABSORPTION-SPECTROSCOPY #ALLOYS #DISPLACEMENTS #Physics, Multidisciplinary
Tipo

article

original article

publishedVersion