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