Abstract
High static magnetic field magnetization measurements have been performed up to 23 T onHo0.43Y2.57Fe5O12 single crystals athelium temperature (T = 4.2 K) with fields applied along the three main cubic axes: , and . The change from the spontaneous ferrimagnetic structure in zero magnetic field to the fullyferromagnetic one in high field takes place through several intermediate phases separatedby transitions with step-like magnetization behaviour, but without any observed hysteresis.Using the effective spin Hamiltonian approximation, we show that the general features ofthese transitions can be accounted for by a large magnetocristalline anisotropy of theHo3+ moments of the uniaxial type along the localz axis of each rare-earth site. The model is in better agreement with the experimentsthan its Ising limit, widely used before, but is still unsuccessful in predicting the‘umbrella’ magnetic structures found by previous neutron and NMR experiments.
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