Abstract
Abstract The effect of pressure on the Curie temperature TC and the martensitic transition temperature TM of the ferromagnetic shape memory alloys Ni50+x(Mn0.5Fe0.5)25Ga25-x has been investigated by measuring the temperature dependence of the initial permeability at various pressures up to ~10 kbar. The pressure derivatives of TC and TM, dTC/dp and dTM/dp, of Ni50(Mn0.5Fe0.5)25Ga25 (x=0) are found to be 0.23 K/kbar and 0.77 K/kbar, respectively. The values of dTC/dp and dTM/dp of Ni50+x(Mn0.5Fe0.5)25Ga25-x alloys decrease with increasing x. Moreover the sign of dTC/dp changes from positive to negative with increasing x. The pressure dependence of TC for Ni50+x(Mn0.5Fe0.5)25Ga25-x alloys is discussed qualitatively based on the dependence of the exchange interactions on interatomic distance.
Original language | English |
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Article number | 308895 |
Pages (from-to) | 83-87 |
Number of pages | 5 |
Journal | Physica B: Condensed Matter |
Volume | 464 |
DOIs | |
Publication status | Published - 2015 May 1 |
Keywords
- Curie temperature
- Martensitic transition temperature
- Pressure effect
- Shape memory alloy
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering