Fabrication of Magnetic Tunneling Junctions with NaCl Barriers
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概要
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We fabricated magnetic tunneling junctions (MTJs) with epitaxial NaCl(001) barriers grown on Fe(001). Thin magnetic layers were grown using a vacuum deposition system and junction patterns were formed using shadow masks installed in the deposition system. We confirmed that a barrier layer of NaCl(001) grows epitaxially on an Fe(001) bottom electrode layer but that the top layer of Fe is polycrystalline. The MTJs show nonlinear current–voltage characteristics and tunneling magneto-resistance (TMR) of ${\sim}3$% at room temperature. The observed TMR ratio is smaller than that expected for an epitaxial barrier with a fourfold symmetric crystal structure. Although the reason for this large discrepancy in TMR ratio between the MTJs with MgO barriers and those with NaCl barriers is unclear at this stage, novel materials such as a family of alkali halides have the potential to function as an applicable barrier for MTJs.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2007-10-15
著者
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Yanagihara Hideto
Institute Of Applied Physics University Of Tsukuba
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Koyano Tamotsu
Cryogenics Center Univ. Of Tsukuba
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Kita Eiji
Institute For Applied Physics Tsukuba University
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Nakazumi Makoto
Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
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Yoshioka Daichi
Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
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