Half-metallic character and electronic properties of inverse magnetoresistant

JAVIER GUEVARA; VERÓNICA VILDOSOLA; JULIÁN MILANO; ANA MARÍA LLOIS

PHYSICAL REVIEW B - SOLID STATE

Año: 2004 vol. 69 p. 18442201 - 18442206

0556-2805

Based on ab initio calculations we find that Fe12xCoxSi alloys in the Fe-rich region behave as a disordered ferromagnetic half metal. Half metallicity can explain the recently found electronic, magnetic, and transport properties. We can also determine a sharp transition from the paramagnetic metallic behavior to the ferromagnetic half-metallic state as a function of Co concentration. At concentrations higher than 0.25 the system starts to segregate Co from Fe atoms, this giving rise to the disappearance of half metallicity and to reflect it in the decreasing value of the magnetic moment.ab initio calculations we find that Fe12xCoxSi alloys in the Fe-rich region behave as a disordered ferromagnetic half metal. Half metallicity can explain the recently found electronic, magnetic, and transport properties. We can also determine a sharp transition from the paramagnetic metallic behavior to the ferromagnetic half-metallic state as a function of Co concentration. At concentrations higher than 0.25 the system starts to segregate Co from Fe atoms, this giving rise to the disappearance of half metallicity and to reflect it in the decreasing value of the magnetic moment.