Magnetic phase transitions in Invar compound studied by high-pressure X-ray magnetic circular dichroism and X-ray diffraction

S. Odin; F. Baudelet; Ch. Giorgetti; E. Dartyge; J. P. Itié; A. Polian; J. C. Chervin; S. Pizzini; A. Fontaine; J. P. Kappler

doi:10.1209/epl/i1999-00399-6

All issues

Volume 47 / No 3 (August I 1999)

Europhys. Lett., 47 3 (1999) 378-383

Abstract

Issue		Europhys. Lett. Volume 47, Number 3, August I 1999


Page(s)		378 - 383
Section		Condensed matter: electronic structure, electrical, magnetic and optical properties
DOI		https://doi.org/10.1209/epl/i1999-00399-6
Published online		01 September 2002

Europhys. Lett., 47 (3), pp. 378-383 (1999)

Magnetic phase transitions in $\rm Fe_{72}Pt_{28}$ Invar compound studied by high-pressure X-ray magnetic circular dichroism and X-ray diffraction

S. Odin¹, F. Baudelet¹, Ch. Giorgetti¹, E. Dartyge¹, J. P. Itié², A. Polian², J. C. Chervin², S. Pizzini³, A. Fontaine³ and J. P. Kappler⁴

¹ LURE, Bât 209D, Centre Universitaire Paris Sud - 91405 Orsay Cedex, France
² Physique des Milieux Condensés, Université Paris VI - BP 77, 75252 Paris 05, France
³ Laboratoire de Magnétisme Louis Néel, CNRS BP 166 38042 Grenoble Cedex 9, France
⁴ IPCMS, 23 rue du Loess - 67037 Strasbourg Cedex, France

Received: 22 June 1998
Accepted: 2 March 1999

Abstract

X-ray magnetic circular dichroism (XMCD) measurements have been performed under high pressure and used to study the disordered $\rm Fe_{72}Pt_{28}$ Invar alloy. The well-known high spin to low spin state transition is observed at 4 GPa. In addition, XMCD evidences a second transition to the nonmagnetic phase at high pressure in the disordered alloy. This result is made unambiguous by comparison to the ordered alloy whose hysteresis cycle of the phase transitions is dramatically different from the disordered alloy. The pressure-dependent collapse of the Curie temperature is the dominant mechanism for reducing the magnetization only in the ordered alloy.

PACS: 78.20.Ls – Magnetooptical effects / 62.50.+p – High-pressure and shock-wave effects in solids and liquids / 81.30.Bx – Phase diagrams of metals and alloys

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