A Calculation on Pressure Dependence of Spin Wave Energy of Invar Alloys

概要

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Under the assumption that the change in volume of the system affects both the band width and molecular field coefficient but the shape of the density-of-states curve remains unaffected, a formula for the pressure dependence of exchange stiffness D is derived. For a system of two dimensional free electrons with step-type density-of-states curve, calculations on D and its pressure dependence dD/dp are performed with reasonable values of parameters. Calculated results well reproduce the observed composition dependence of the reduced values of D and dD/dp for fee Fe-Ni alloy system, while the calculated absolute values themselves are smaller by about an order of magnitude than the observed ones.
信州大学理学部の論文
1974-10-05