Direct measurement of magnetization isotherms of Fe64Ni36 Invar alloy in a diamond anvil cell

• Published in: High pressure research Vol. 34; no. 4; pp. 365 - 370
• Main Authors: Kamarád, J., Míšek, M., Arnold, Z.
• Format: Journal Article
• Language: English
• Published: Taylor & Francis 02-10-2014
• Subjects: DAC; Invar; magnetization; pressure
• DOI: 10.1080/08957959.2014.971024
• EISSN: 1477-2299
• ISSN: 0895-7959

Magnetization isotherms of the Fe
64
Ni
36
Invar alloy have been measured under pressure up to 5.3 GPa in magnetic field up to 5 T using a diamond anvil cell and SQUID magnetometer. The unambiguous change of the pressure parameter dlnM
S
/dP (from −9 to −13×10
−2
 GPa
−1
) has been observed in a narrow pressure interval from 2.5 to 3.5 GPa at all temperatures in the range from 5 to 300 K. The pressure interval, where the sharp decrease in magnetization was observed, coincides with the critical pressures of the pressure-induced decrease in Fe-moment that were determined by the X-ray Magnetic Circular Dichroism and the X-ray Emission Spectra studies, recently. The pronounced decrease in the Curie temperature of the Fe
64
Ni
36
alloy under pressure, dT
C
/dP = −44 ±2 K/GPa, has been confirmed.