Magnetic Studies at the Research Institute for Iron, Steel and Other Metals
- 1 March 1965
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 36 (3) , 988-992
- https://doi.org/10.1063/1.1714291
Abstract
A brief survey of several investigations is presented. (1) Spin‐flopping magnetization measurements up to 80 kOe in α Fe2O3 in the low‐temperature state are reported. The temperature dependence of the uniaxial anisotropy constant is obtained therefrom. Its magnitude is of the order of 104 erg/cc and increases with decreasing temperature. Measurements with the field perpendicular to the trigonal axis reveal that at a temperature in the transition region (240°K), the magnetic state moves first toward the high‐temperature behavior with weak ferromagnetism, but above 60 kOe it returns to the antiferromagnetic low‐temperature state. (2) Thermomagnetic measurements on CaFeO2.5 and CaFe4O7 indicate that a weak ferromagnetism appears at 400°C. From the crystal structure, a Dzyaloshinsky‐Moriya canting is suggested to account for the weak moment. (3) High‐field measurements of MnAu2 extend to low temperatures the previous data on its transition field (screw‐type antiferromagnetism to ferromagnetism). The screw angle appears to be changing slowly even below 80°K. Longitudinal and transverse magnetostriction measurements in MnAu2 are reported through the transition and up to 80 kOe. Relative length changes of about 10−4 are observed and significant volume contractions during the screw‐flopping and rotation stages are inferred. (4) Saturation moment and Curie point measurements of Pd‐Fe alloys (near 30 at. % Pd) are reported and compared with similar Invar‐type behavior in Ni‐Fe alloys.This publication has 7 references indexed in Scilit:
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