Tunneling Magnetoresistance above Room Temperature in La0.7Sr0.3MnO3/SrTiO3/La0.7Sr0.3MnO3 Junctions
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概要
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We have investigated the undesired reduction of spin polarization in La1-xSrxMnO3 (LSMO)/SrTiO3 (STO)/LSMO spin tunnel junctions by employing superlattices of LSMO/STO with various $x$ of 0.2, 0.3, and 0.4. The systematic data revealed that the instability towards the A-type (layered) antiferromagnetic phase dominates the suppressed ferromagnetism by spin canting in the vicinity of the interface as $x$ increases. Another boundary condition of reduced Curie temperature ($T_{\text{C}}$) for $x<0.3$ gives us a trade-off for the choice of $x$ in spin tunnel junctions. Indeed, atomically regulated LSMO/STO/LSMO tunnel junctions with $x=0.3$ show tunneling magnetoresistance above room temperature up to 320 K, which agrees well with $T_{\text{C}}$ of the superlattices with the same $x$.
- INSTITUTE OF PURE AND APPLIED PHYSICSの論文
- 2003-04-01
著者
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IZUMI Makoto
Joint Research Center for Atom Technology (JRCAT)
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KAWASAKI Masashi
Joint Research Center for Atom Technology (JRCAT)
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TOKURA Yoshinori
Joint Research Center for Atom Technology (JRCAT)
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Ogimoto Yasushi
Joint Research Center For Atom Technology (jrcat)
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Manako Takashi
Fundamental Research Laboratories Nec Corporation
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Sawa Akihito
Correlated Electron Research Center (cerc)
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Akoh Hiroshi
Correlated Electron Research Center (cerc) National Institute Of Advanced Industrial Science And Tec
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SATO Hiroshi
Correlated Electron Research Center (CERC), National Institute of Advanced Industrial Science and Technology (AIST)
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Akoh Hiroshi
Correlated Electron Research Center (CERC), The National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba 305-8562, Japan
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Manako Takashi
Fundamental Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba 305-8501, Japan
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Sawa Akihito
Correlated Electron Research Center (CERC), The National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba 305-8562, Japan
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Ogimoto Yasushi
Joint Research Center for Atom Technology (JRCAT), 1-1-4 Higashi, Tsukuba 305-0046, Japan
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