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Temperature- and magnetic-field-induced phase transitions in Fe-rich FePt alloys

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Temperature- and magnetic-field-induced phase transitions in Fe-rich FePt alloys

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Title: Temperature- and magnetic-field-induced phase transitions in Fe-rich FePt alloys
Author: Rong, Chuanbing; Liu, J. Ping
Abstract: Structural and magnetic properties of the FexPt100-x (x=78–88) alloys have been investigated. It is found that for all of the investigated compositions, a phase transition occurs from the disordered γ phase to the ordered α phase during cooling, while a reverse process takes place during heating. Moreover, magnetic fields also induce a phase transition from the γ phase to the α phase near the transition temperature. The temperature- and magnetic-field-induced phase transitions give rise to a huge negative thermal expansion and thus a giant magnetic entropy change (up to 39.8 J/kg K for the alloy with x=79). The contribution of the magnetic field induced phase transition to the total magnetic entropy change is estimated to be around 20%–25%.
URI: http://hdl.handle.net/10106/4994
Date: 2007-06-01
External Link: http://link.aip.org/link/APPLAB/v90/i22/p222504/s1

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