Study on Magnetic Tunnel Junction(Special Issue on Selected Papers from the 5th Asian Symposium on Information Storage Technology)
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概要
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Magnetic tunnel junctions(MTJ), i.e., structures consisting of two ferromagnetic layers(FM_1 and FM_2), separated by a very thin insulator barrier(I), have recently attracted attention for their large tunneling magnetoresistance(TMR)which appears when the magnetization of the ferromagnets of FM_1 and FM_2 changes their relative orientation from parallel to antiparallel in an applied magnetic field. Using an ultrahigh vacuum magnetron sputtering system, a variety of MTJ structures have been explored. Double Hc magnetic tunnel junction, NiFe/Al_2O_3/Co and FeCo/Al_2O_3/Co, were fabricated directly using placement of successive contact mask. The tunnel barrier was prepared by in situ plasma oxidation of thin Al layers sputter deposited. For NiFe/Al_2O_3/Co junctions, the maximum TMR value reaches 5.0% at room temperature, the switching field can be less than 10 Oe and the relative step width is about 30 Oe. The junction resistance changes from hundreds of ohms to hundreds of kilo-ohms and TMR values decrease monotonously with the increase of applied junction voltage bias. For FeCo/Al_2O_3/Co junctions, TMR values exceeding 7% were obtained at room temperature. It is surprising that an inverse TMR of 4% was observed in FeCo/Al_2O_3/Co. The physics governing the spin polarization of tunneling electrons remains unclear. Structures, NiFe/FeMn/NiFe/Al_2O_3/NiFe, in which one of the FM layers is exchange biased with an antiferromagnetic FeMn layer, were also prepared by patterning using optical lithography techniques. Thus, the junctions exhibit two well-defined magnetic states in which the FM layers are either parallel or antiparallel to one another. TMR values of 16% at room temperature were obtained. The switching field is less than 10Oe and step width is larger than 30Oe.
- 社団法人電子情報通信学会の論文
- 2001-09-01
著者
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ZHANG Wei
National Human Genome Research Institute, National Institutes of Health
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Zhang W
Data Storage Institute
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HU An
National Laboratory of Solid State Microstructures, Nanjing University
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Hu An
National Laboratory Of Solid State Microstructures Nanjing University
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Du Jun
National Laboratory Of Solid State Microstructures Nanjing University:the Department Of Physics And
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YOU Biao
National Laboratory of Solid State Microstructures, Nanjing University
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SHENG Wenting
National Laboratory of Solid State Microstructures, Nanjing University
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LU Mu
National Laboratory of Solid State Microstructures, Nanjing University
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Lu M
National Laboratory Of Solid State Microstructures Nanjing University
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Sheng Wenting
National Laboratory Of Solid State Microstructures Nanjing University
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You Biao
National Laboratory Of Solid State Microstructures Nanjing University
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Zhang Wei
National Heart Center Of Singapore
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Zhang Wei
National Laboratory Of Solid State Microstructures Nanjing University
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