Giant magnetic coercivity in CaCu5-type SmNi3TSi (T=Mn–Cu) solid solutionsстатья
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Дата последнего поиска статьи во внешних источниках: 11 декабря 2015 г.
Аннотация:The effects of transition metal substitution for Ni on the magnetic properties of the CaCu5-type SmNi3TSi (T = Mn, Fe, Co, Cu) solid solutions have been investigated. SmNi3MnSi, SmNi3FeSi, SmNi3CoSi and SmNi3CuSi show ferromagnetic ordering at 125 K, 190 K, 46 K and 12 K and field induced transitions at 65 K, 110 K, 30 K and 6 K, respectively. The magnetocaloric effects of SmNi3TSi (T = Mn, Fe, Co, Cu) were calculated in terms of isothermal magnetic entropy change (dSm). The magnetic entropy dSm reaches value of –1.1 J/kg*K at 130 K for SmNi3MnSi, –0.4 J/kg*K at 180 K for SmNi3FeSi, –0.37 J/kg*K at 45 K for SmNi3CoSi and –0.5 J/kg*K at 12 K for SmNi3CuSi in field change of 0-50 kOe around the ferromagnetic ordering temperature. They show positive dSm of +2.4 J/kg*K at 30 K for SmNi3MnSi, –2.6 J/kg*K at 65 K for SmNi3FeSi, +0.73 J/kg*K at 15 K for SmNi3CoSi and –0.5 J/kg*K at 6 K for SmNi3CuSi in field change of 0-50 kOe around the metamagnetic-like transition temperature. Below the field induced transition temperature, SmNi3TSi (T = Mn, Fe, Co, Cu) exhibits giant magnetic coercivity of 80 kOe at 20 K for SmNi3MnSi, 87 kOe at 40 K for SmNi3FeSi, 27 kOe at 20 K for SmNi3CoSi and 54 kOe at 5 K for SmNi3CuSi.