Abstract
In this work, we report a theoretical investigation of the magnetocaloric effect in the ferromagnet HoNi 2. To carry out this investigation, we have used a model Hamiltonian that takes into account the crystalline electric field (CEF) and the exchange interaction. Using the proper experimental CEF and exchange parameter, ascribed for HoNi 2, a change of the easy magnetization direction, from 〈110〉 to 〈001〉 was predicted at T=1.5 K for the critical magnetic field H∼2.4 T. The anomalous peak in the isothermal magnetic entropy change and in the adiabatic temperature change with magnetic field was calculated and analysed for the three main crystallographic directions.
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