Oscillation of giant tunneling magnetoresistance with respect to tunneling barrier thickness in fully epitaxial Fe∕MgO∕Fe magnetic tunnel junctions
2007; American Institute of Physics; Volume: 90; Issue: 25 Linguagem: Inglês
10.1063/1.2750398
ISSN1520-8842
AutoresRie Matsumoto, Akio Fukushima, Taro Nagahama, Yoshishige Suzuki, Koji Ando, Shinji Yuasa,
Tópico(s)Physics of Superconductivity and Magnetism
ResumoThe authors fabricated fully epitaxial Fe(001)∕MgO(001)∕Fe(001) magnetic tunnel junctions (MTJs) with various MgO thicknesses (tMgO) and investigated spin-dependent transport properties. Both the tunneling resistance in the parallel magnetic state (RP) and that in the antiparallel magnetic state (RAP) exhibited short-period oscillations as functions of tMgO with the same period of 3.2Å and different phases. RAP also showed a long-period oscillation with a period of 9.9Å. As a result, tMgO dependence of magnetoresistance is expressed as a superposition of the short- and long-period oscillations. These results provide important clues for understanding the oscillatory tMgO dependence of the tunneling magnetoresistance effect.
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