Accession Number : AD0625486

Title :   EFFECTS OF PRESSURE ON MAGNETIC INTERACTIONS.

Descriptive Note : Final rept. 1 Aug 64-31 Oct 65,

Corporate Author : GENERAL ELECTRIC CO SCHENECTADY N Y RESEARCH AND DEVELOPMENT CENTER

Personal Author(s) : Kouvel,J. S. ; Morgan,C. R.

Report Date : DEC 1965

Pagination or Media Count : 10

Abstract : A hydrostatic-pressure furnace system was designed, constructed, and assembled, and then tested at pressures up to about 10 kb. With this system, initial measurements were made at various fixed pressures of the critical temperature for the abrupt antiferromagnetic-ferromagnetic transition in the ordered alloy FeRh. The critical temperature, which is marked by a large sudden change in resistivity, was observed to increase rapidly with increased compression. This pressure dependence was then used quantitatively in evaluating the entropy change associated with the transition. The value thus obtained for the change in entropy agrees fairly closely with that recently deduced from the measured variation in critical temperature with applied magnetic field. Some discrepancy does exist, however, between these results and those previously derived form similar measurements. A fuller account of the pressure experiments with FeRh is given.

Descriptors :   (*MAGNETIC PROPERTIES, PRESSURE), (*COMPRESSIVE PROPERTIES, MAGNETIC PROPERTIES), FERROMAGNETISM, ANTIFERROMAGNETISM, ELECTRICAL RESISTANCE, THERMODYNAMICS, ENTROPY, RHODIUM, IRON ALLOYS

Subject Categories : Electricity and Magnetism
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE