Giant magnetic coercivity in orthorhombic YNi4Si-type SmNi4Si compoundстатья
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Дата последнего поиска статьи во внешних источниках: 19 октября 2015 г.
Аннотация:Magnetic properties, magnetocaloric effect and heat capacity of YNi4Si-type SmNi4Si compound have been investigated. SmNi4Si exhibits ferromagnetic transition at 17 K. Below ~9 K, the magnetic isotherms of SmNi4Si show metamagnetic-like behavior with critical field of 20 kOe at 5 K. Heat capacity measurements of SmNi4Si show the electronic heat capacity coefficient Gamma = 94 mJ/(mol*K2), phonon coefficient Beta = 0.35 mJ/(mol*K4) and Debye temperature TD = 310 K. The magnetocaloric effect of SmNi4Si is calculated in terms of isothermal magnetic entropy change which is obtained by the isothermal magnetization (dSmmagn) and heat capacity measurements (dSmheat). Both dSmmagn and dSmheat reach a maximum of –1.0 J/kg*K at 17 K for a field change of 50 kOe and they show positive values for a field change of 20 kOe at ~9 K. Below 15 K, SmNi4Si shows large magnetic hysteresis with considerable remanence and below ~9 K it exhibits giant coercive field of 58 kOe at 5 K in an applied field of 90 kOe.