The exchange constants in the ferrimagnetic garnets R3 Fe5 O12 (R=Y3+, Gd3+ and Dy3+) have been obtained from the experimental data on saturation magnetisation and inverse susceptibility. The sign and magnitude of the exchange constants in Y3Fe5O12 have been explained on the basis of Anderson’s theory of superexchange. The low temperature magnetisation data in Dy3Fe5O12 have been explained by assuming canting on thec sublattice.
Volume 43, 2020
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