We investigated the interfacial mixing phenomena associated with magnetoresistance and exchange coupling in a top spin valve (T-SV) and bottom spin valve (B-SV) at IrMn/CoFe and CoFe/IrMn interfaces. The difference in the surface free energies of IrMn and CoFe is the major factor determining the degree to which interfacial mixing occurs, but it depends on the deposition sequence. A B-SV featuring a gradational IrMn/CoFe interface had a small H ex in the as-deposited state, but showed improved exchange coupling on annealing as a result of limited interdiffusion. By contrast, a T-SV featuring a sharp CoFe/IrMn interface had a high Hex in the as-deposited state, but suffered a reduction in exchange coupling on annealing, due to a moderate level of interdiffusion.
|Number of pages||4|
|Journal||Physica Status Solidi (C) Current Topics in Solid State Physics|
|Publication status||Published - 2007|
|Event||International Symposium on Advanced Magnetic Materials and Appilications, (ISAMMA 2007) - Jeju, Korea, Republic of|
Duration: 2007 May 28 → 2007 Jun 1
ASJC Scopus subject areas
- Condensed Matter Physics