Abstract
This paper is focused on the study of magneto crystalline anisotropy which we performed on oriented TbMn0.98Fe0.02O3 single crystal by magnetization and AC susceptibility measurements. Our measurements revealed huge magneto crystalline anisotropy with respect to main crystallographic axes. The paramagnetic Weiss temperature θp spans a broad range of values which can indicate the strong magnetocrystalline anisotropy in the system. Easy magnetization axis is c-axis and b-axis is hard magnetic axis. The magnetic phase transitions at TN, Tlock and T1 are connected with anomalies in magnetization and AC susceptibility measurements performed along b-axis. Field induced magnetic transitions were observed at 2 K in the case of a sinusoidally modulated collinear magnetic structure for magnetization measurements along a-axis and c-axis. Hysteresis loops measurements indicate suppression of Tb3+ ordering in high magnetic field which depends on crystal orientation. In respect to iron doping our results resemble and extend results obtained on powdered crystals. Iron doping shifts both TN and Tlock to lower temperatures, antiferromagnetic JAF interaction in ac-plane decreases leaving barely changed ferromagnetic interaction JF. The critical field of the field induced phase transition increases with iron doping.
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