The spin reorientation phenomenon in materials such as the orthoferrites can be used for thermomagnetic writing. This mechanism has been used to write into platelets of Sm0.7Er0.3FeO3 which has its spin reorientation just above room temperature. Curie point writing can be done in those orthoferrites in which there is no spin reorientation in the working temperature range. Spots 5 μ in diameter were written into 2-μ-thick sputtered epitaxial TbFeO3 films by the Curie technique to demonstrate the feasibility of high storage densities.
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Kurtzig et al. (1971) studied this question.
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