Magnetoelastic and pressure effects at the antiferro{endash}ferromagnetic transition in Hf{sub 1{minus}{ital x}}Ta{sub {ital x}}Fe{sub 2{minus}{ital y}} alloys
- Departamento de Fisica de la Materia Condensada-ICMA, Facultad de Ciencias, Universidad de Zaragoza, CSIC, 50009 Zaragoza (Spain)
- Institute of Physics, AS CR, Cukrovarnicka 10, 162 00 Prague 6 (Czech Republic)
Magnetostriction measurements using high-pulsed magnetic fields up to 14 T and thermal expansion measurements under hydrostatic pressure up to 12 kbar have been performed in Hf{sub 1{minus}{ital x}}Ta{sub {ital x}}Fe{sub 2{minus}{ital y}} alloys with {ital x}=0.17 and 0.15 and {ital y}=0.02. These compounds have a first-order magnetic phase transition from an antiferromagnetic (AF) high-temperature state to a ferromagnetic (F) low-temperature state at {ital T}{sub AF{endash}F}=246 and 290 K, respectively. This transition is accompanied by a volume expansion from the low-volume AF state to the high-volume F state of {Delta}{ital V}/{ital V}{approx_equal}0.56{percent} and 0.38{percent} for {ital x}=0.17 and 0.15, respectively. Hydrostatic pressure decreases significantly the AF{endash}F transition temperature, whereas the thermal expansion anomaly becomes more pronounced. The dependence of {ital T}{sub AF{endash}F} on pressure follows a quadratic behavior and {ital T}{sub AF{endash}F} reaches a value of 106 K at 10.5 kbar for {ital x}=0.17. In search of high magnetostrictive materials, we have found a giant volume magnetostriction value (e.g., {omega}{approx_equal}0.7{percent} for the {ital x}=0.17 compound) in these alloys at a moderate applied magnetic field within the AF phase near room temperature, making these alloys potential candidates for magnetostrictive transducers. {copyright} {ital 1996 American Institute of Physics.}
- OSTI ID:
- 397428
- Journal Information:
- Journal of Applied Physics, Vol. 80, Issue 12; Other Information: PBD: Dec 1996
- Country of Publication:
- United States
- Language:
- English
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