10:30 AM - 10:45 AM
▲ [16a-3A-6] Growth and characterization of insulating ferromagnetic semiconductor (Al,Fe)Sb
Keywords:spin filter,ferromagnetic semiconductor,Fe-based FMS
We investigate the crystal structure, transport and magnetic properties of Fe-doped ferromagnetic semiconductor (Al1-x,Fex)Sb up to x = 14% grown by molecular beam epitaxy. All samples show p-type conduction at room temperature and insulating behavior at low temperature. Careful chracterization of the crystal structure by X-ray diffraction and scanning transmission electron microscopy shows that (Al1-x,Fex)Sb samples with x ≤ 10% maintain the zinc blende crystal structure of the host material AlSb. Intrinsic ferromagnetism with a Curie temperature (TC) of 40 K was observed for the sample with x = 10% Fe. This is the first observation of ferromagnetism in Al-V (As or Sb) semiconductors, which paves the way to realize a spin-filtering tunnel barrier that is compatible to III-V semiconductors spin devices.