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A remarkable influence of Ru3+ ions on the anisotropy of single crystals of PbFe12O19 was found. Single crystals of PbFe12−xRuxO19 were grown by flux method. For small addition of Ru ions, the uniaxial anisotropy constant K1 increases sharply, and reaches a maximum at x = 0.05. Then, the K1 tends to decrease with further increasing x. A maximum relative increment of 27% in K1 was obtained at 273°K. Also, the variation of K1 and Ha with T in a range of 100–273°K was investigated. For the crystals with x = 0.35, the phenomenon of spin reorientation was observed with the change of easy direction from c axis to basal plane at the temperature around 200°K. Below 200°K, K1 becomes negative. In addition, K2 increases monotonously with decreasing temperature.
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Zhai et al. (1981) studied this question.
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