Abstract

The new class of magnetic materials with low temperature magnetic relaxation was studied. It was evidenced that the crystal DyA1O 3 with antiferromagnetically ordered high anisotropy rare-earth ions showed an exponential magnetic relaxation. For the first time low temperature magnetic relaxation was investigated by means of magnetostriction and rare-earth optical absorption spectra instead of standard magnetization measurements. The possible mesoscopic nature of tunneling process was suggested.

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