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이방성 자기저항측정을 이용한 NiO / NiFe 박막의 교환결합연구
김종기(Jong-Kee Kim),김선욱(Sun-Wook Kim),이기암(Ky-Am Lee),이상석(Sang-Suk Lee),황도근(Do-Guwn Hwang) 한국자기학회 2002 韓國磁氣學會誌 Vol.12 No.4
We report an experimental evidence of coexistence of the strong and weak exchange couplings in unidirectional NiO/NiFe (antiferromagnetic/ferromagnetic) bilayer thin films. The exchange bias was measured by VSM and AMR techniques and then, analyzed into the strong and weak exchange couplings by means of a regression method. In NiO(60 ㎚)/NiFe(10 ㎚) film, the ratio of the weak exchange coupling field over the average exchange coupling field was found to be almost unchanged within a range from 0.2 to 0.4 irrespective to the strength of an applied field. However, the ratio increased among the samples with decreasing the average exchange coupling field due to the increment of the weak exchange coupling area.
자연산화된 자유층을 갖는 NiO 스핀밸브 박막의 자기저항특성
김종기(Jong-Kee Kim),주호완(Ho-Wan Joo),이기암(Ky-Am Lee),황도근(Do-Guwn Hwang),이상석(Sang-Suk Lee),박달호(Dal-Ho Park) 한국자기학회 2001 韓國磁氣學會誌 Vol.11 No.3
The effect of specular electron scattering on natural oxidation of free layer in NiO spin valves have been investigated. The magnetoresistance (MR) ratio and the exchange biasing field (Hex) of NiO(600 Å)/Ni_(81)Fe_(19)(50 Å)/Co(7 Å)/Cu(20 Å)/ Co(7 Å)/Ni_(81)Fe_(19)(70 Å) spin valves were increased from 4.9 % to 7.3 %, and 110 Oe to 170 Oe after natural oxidation in the atmosphere for 80 days, respectively. The sheet resistivity p decreased from 28 μΩm to 17 μΩm, but Δp did not almost change after the oxidation. The spin valves enhanced by the specular electron scattering in the naturally oxidized Co/NiFe/NiFeOx, free layer were confirmed from the depth profiles using Auger electron spectroscopy.
α-Fe₂O₃ / NiFe / Cu / NiFe 스핀밸브 박막에서의 자기저항 특성에 대한 연구
김종기(Jong-Kee Kim),주호완(Ho-Wan Joo),이기암(Ky-Am Lee),황도근(Do-Guwn Hwang),이상석(Sang-Suk Lee) 한국자기학회 2000 韓國磁氣學會誌 Vol.10 No.1
We investigated the magnetoresistance effect and the exchange coupling of antiferromagnetic Fe₂O₃ spin-valve film. The X-ray diffractions of the spin-valve films having a different thickness of a α-Fe₂O₃ were measured. The exchange coupling field (Hex) between Fe₂O₃ and pinned NiFe layer was increased from 13.5 Oe to 84.5 Oe, as the thickness of Fe₂O₃ increased from 400 Å to 800 Å. The surface roughness of α-Fe₂O₃ spin-valves increased with the increase of α-Fe₂O₃ thickness. Therefore, the increase of Hex will be due to the increase of the interface roughness. The MR ratios as a function of Fe₂O₃ thickness was not changed. And Hex increased by the increment of magnetostatic coupling between Fe₂O₃ and NiFe (pinned-layer) due to the increment of interface roughness. Hex depends on the surface roughness, but the magnetoresistance ratio doesn't.
[Pd / Co]5 / FeMn 막에서의 바닥층과 삽입층에 의한 교환바이어스수직자기이방성
주호완(Ho Wan Joo),안진희(Jin Hee An),이미선(Mi Sun Lee),김보근(Bo Keun Kim),최상대(Sang Dea Choi),이기암(Kee Am Lee) 한국자기학회 2004 韓國磁氣學會誌 Vol.14 No.5
Magnetic properties by exchange biased perpendicular magnetic anisotropy in [Pd(0.8 ㎚)/Co(0.8 ㎚)]_5/FeMn(15 ㎚) multilayers deposited by dc magnetron sputtering system are investigated. As inserted Pd layer of interface between [Pd/Co] multilayer and FeMn film, the Hex of perpendicular anisotropy was improved from 127 Oe to 145 Oe. But result of an experiment by thermal stability, the Hex of the case that an inserted layer was inserted in decreased from low 200℃ in about 50℃ more if not inserted. If Ta was a buffer layer, the experiment results along material of buffer layer, the Hex obtained the largest 127 Oe. And if Pd was a buffer layer, Hex obtained the largest 169 Oe. Also, the Hc in buffer layer of Ta and Pd obtained the largest 203 Oe and 453 Oe, respectively.
[Pd / Co]N / FeMn 다층막에서의 교환바이어스 수직자기이방성과 열적안정성
주호완(Ho-Wan Joo),안진희(Jin-Hee An),김보근(Bo-Keun Kim),김선욱(Sun-Wook Kim),이기암(Kee-Am Lee),황도근(Do-Geun Hwang),이상석(Sang-Suk Lee) 한국자기학회 2004 韓國磁氣學會誌 Vol.14 No.4
Magnetic properties and thermal stability by exchange biased perpendicular magnetic anisotropy in [Pd/Co]_N/FeMn multilayer deposited by dc magnetron sputtering system are investigated. We measured the perpendicular magnetization curves of [Pd(0.8 ㎚)/Co(0.8 ㎚)]_5/FeMn multilayer as function of FeMn thickness and annealing temperature. As FeMn thickness increases from 0 to 21 ㎚, the perpendicular exchange bias(Hex) obtained 127 Oe at FeMn thickness 15 ㎚. As the annealing temperature increases to 240℃, the Hex increased from 115 Oe to 190 Oe and disappeared exchange biased perpendicular magnetic anisotropy effect at 330℃.