MAGNETOVOLUME EFFECTS OF ITINERANT ELECTRON FERROMAGNETS .2. PRESSURE DEPENDENCE OF SPONTANEOUS MAGNETIZATION AND FORCED- AND SPONTANEOUS-VOLUME MAGNETOSTRICTION AT 0 DEGREES K

Pressure dependence of spontaneous magnetization and forced- and spontaneous-volume magnetostriction in itinerant electron ferromagnets at 0°K are formulated. Dependence on atomic volume of the band width and of the molecular field coefficient are taken into account. It is shown that the spontaneous volume magnetostriction ωs, must be negative when the forced one ωH, is negative while the former may be positive or negative when the latter is positive. It is easily understood why ωH is positive or whereas ωs is negative in Ni, Fe and some Ni-Fe alloys. If Kanamori's theory considering the correlation between electrons is applied to the molecular field coefficient, then ωH is positive at 0°K. So far has been found no metallic ferromagnets with negative ωH at low temperature, with an exception of dilute Fe-alloys. Diagrammatic representation to relate the density of states to forced- and spontaneous-volume magnetostriction is given. © 1969, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.