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Co/IrMn 이층막의 자기적 특성과 Co 두께 및 어닐링의 영향
정정규,이찬규,구본흔,이건환,야스노리하야시,Jung, Jung-Gyu,Lee, Chan-Gyu,Koo, Bon-Heun,Lee, Gun-Hwan,Hayashi, Yasunori 한국재료학회 2003 한국재료학회지 Vol.13 No.7
Effects of annealing and thickness of Co layer in Co/IrMn bilayers on the magnetic properties have been investigated. The highest interfacial exchange coupling energy($J_{K}$ = 0.12 erg/$\textrm{cm}^2$) was obtained for 10 nm Co layer thickness. Exchange bias field is inversely proportional to the magnetization, the thickness of the pinned layer, and the grain size of antiferromagnetic layer. Also it is related to the interfacial exchange energy difference, which is expected to depend on the surface roughness. These results almost agree with the random-field model of exchange anisotropy proposed by Malozemoff. Exchange bias field decreased slowly with increasing annealing temperature up to X$300^{\circ}C$. However, exchange bias field increased above $300^{\circ}C$.
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IrMn 교환결합층을 갖는 스핀밸브막에서의 열적안정성과 자구구조 관찰
이병선,정정규,이찬규,구본흔,야스노리 하야시,Lee Byeong-Seon,Jung Jung-Gyu,Lee Chang-Gyu,Koo Bon-Heun,Hayashi Yasunori 한국재료학회 2004 한국재료학회지 Vol.14 No.2
We have investigated the magnetic domain structure and the thermal stability of magnetotransport properties of IrMn biased spin-valves containing Co, CoFe and NiFe. The magnetic domain structures were imaged using a magneto-optical indicator film(MOIF) technique. To investigate the thermal stability, magnetoresistance(MR) was measured at annealing temperature(TANN) and room temperature($T_{RT}$) followed by the annealing. Domain imaging reveal that the increase of annealing temperature led to changes in the exchange coupling between the two ferromagnet(FM) layers through nonmagnetic layer rather than between FM and antiferromagnet. unlike the NiFe biased IrMn spin valve with large domains, MOIF pictures of Co and CoFe biased IrMn spin valve structures show the formation of many small microdomains. The magnetic structure, as revealed by the domain images, appeared unchanged while the MR dropped dramatically. From the combined giant magnetoresistance(GMR) and MOIF results, it was apparent that the decrease of MR ratio was not related to the spin valve magnetic structure up to about $350^{\circ}C$($T_{RT}$ ).
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