반강자성층에 따른 스핀밸브막의 자기적특성 및 열적안정성에 관한 연구
Magnetic properties and thermal stability in spin-valve films with various antiferromagnetic layers
반강자성층 스핀밸브막 자기적특성 열적안정성;
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To determine thermal stability and magnetic properties in spin valve films with α-Fe_(2)O_(3), IrMn and PtMn exchange biased layers, The spin-valve sandwiches were deposited on Si(100) by RF reactive sputtering and DC magnetron sputtering. In order to understand the thermal degradation of magnetoresistance (MR) of spin valves. MR ratio of as-deposited α-Fe_(2)O_(3), IrMn, PtMn spin-valves were 12 %, 9.6 % and 4.5 %, respectively. The MR ratio measurements were made at annealing temperature (T_(ANN)) and room temperature (T_(RT)) upon subsequent cooling for thermal stability. The MR ratio at annealing temperature (T_(ANN)) decreased linearly with temperature increase and the MR properties disappeared at about 300 ℃ and 200 ℃ in α-Fe_(2)O_(3) and IrMn S-V, respectively. However, The MR ratio at room temperature (T_(RT)) after annealing was essentially not changed up to 200 ℃ and 300 ℃ in α-Fe_(2)O_(3) and IrMn S-V, respectively. In addition, the exchange bias field is related to the interfacial exchange energy difference, which is expected to depend on the surface roughness. Thus, the spin-valve films with a α-Fe_(2)O_(3) and IrMn antiferromagnetic layer clearly had a high large GMR output and showed an effective magnetic field sensitivity for suitable spin-valve head materials.