Magnetoelastic and Optical Studies of Low Temperature Magnetic Relaxation in Rare-Earth Orthoaluminates with Ising Ions

I. Krynetskiia, A. Popkovb, M.T. Borowiecc, H. Szymczakc and T. Zayarnyukc a Moscow State University, 119899, Vorob'evu Goru, Moscow, Russia b State Research Institute for Physical Problems 103460, Zelenograd, Moscow, Russia c Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland

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The new class of magnetic materials with low temperature magnetic relaxation was studied. It was evidenced that the crystal DyAlO3 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.

DOI: 10.12693/APhysPolA.97.889 PACS numbers: 75.40.Gb, 75.50.Ee