PRESSURE AND TEMPERATURE DEPENDENCE OF THE Fe$sup 57$ NUCLEAR MAGNETIC RESONANCE FREQUENCY IN FERROMAGNETIC IRON

Journal Article · Wed Mar 01 04:00:00 EST 1961 · Journal of Applied Physics (U.S.)

DOI:https://doi.org/10.1063/1.2000368· OSTI ID:4056227

Benedek, G B; Armstrong, J

The pressure dependence of the Fe/sup 57/ nuclear magnetic resonance frequency nu in ferromagnetic iron was measured from 1 to 10,000 kg/cm/sup 2/ at --77 deg , 0 deg , and 84.2 deg C. From these measurements the volume dependence of nu was obtained, and measurements of nu (T)/sub P=1//sub atm/ were corrected for the effects of thermal expansion. By making a slmilar correction for the effect of thermal expansion on the temperature dependence of the saturation magnetization sigma , it was found that, at constant volume, the hyperfine coupling constant A in the relation nu = A sigma is an explicit function of the temperature. Thus, measurements of the temperature dependence of nu , even when corrected to constant volume, do not give accurately the temperature dependence of sigma . The results of a theory based on Stoner's collective electron model for the d electrons are presented to account for the temperature dependence of A. (auth)

• Research Organization: Harvard Univ., Cambridge, Mass.
• Sponsoring Organization: USDOE
• NSA Number: NSA-15-014870
• OSTI ID: 4056227
• Journal Information: Journal of Applied Physics (U.S.), Journal Name: Journal of Applied Physics (U.S.) Vol. Vol: 32: No. 3, Suppl.; ISSN JAPIA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ATOMIC MODELS
COUPLING
ELECTRONS
EXPANSION
FERROMAGNETIC MATERIALS
FREQUENCY
HYPERFINE STRUCTURE
INTERACTIONS
IRON 57
MAGNETIC FIELDS
MEASURED VALUES
PHYSICS
PRESSURE
TEMPERATURE
VOLUME