Magnetoresistance of an Fe_4N/Fe_3O_4 Granular System
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概要
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Mixtures of γ'- Fe_4N/Fe_3O_4 were prepared from Fe_3O_4 nano-particles in NH_3+H_2 mixed gases. By controlling the sintering temperature and time. various samples of (Fe_4N)_x(Fe_3O_4)_<1-x>, with values of x between 0 and 1 were successfully obtained. The magnetization σ and the magnetic parameters of saturation magnetization σ _s, remanent magnetization σ_r and coercive force H_c could be explained by the non-interactive co-existence of γ'-Fe_4N and Fe_3O_4 phase in each sample. The temperature and field dependences of the resistivity showed that good tunneling magneto-resistance (TMR) junctions were formed at x=0.34-0.37 near and below the percolation threshold of x_c=0.4. A large magneto-resistance ratio of -8% was observed for a sample with x=0.34 at room temperature. The effective TMR barriers in this system are assumed to be γ(orα)-Fe_2O_3 or Fe_nN (n=2 or 3) in the grain boundaries of Fe_30_4/Fe_30_4, Fe_30_4/Fe_4N and Fe_4N/Fe_4N. / Mixtures of γ'- Fe_4N/Fe_3O_4 were prepared from Fe_30_4 nano-particles in NH_3+H_2 mixed gases. By controlling the sintering temperature and time, various samples of (Fe_4N)_x(Fe_3O_4)_<1-x> with value of x between 0 and 1 were successfully obtained. The magnetization σ and magnetic parameters of σ_s, σ_r and H_ccould be explained by the noninteractive co-existence of γ' Fe_4N and Fe_30_4 phase in each sample. The temperature and field dependence of the resistivity showed that good TMR junctions were formed at x=0.34-0.37 near and below the percolation threshold of x_c =0.4. It should be noted that a large |MRR| value of 8% was observed for an x=0.34 sample at room temperature, which may be due to the effective TMR barriers in the grain boundaries between Fe_3O_4 particles. If the Fe_3O_4/Fe_4N junction shows a negative MRR, the possibility of negative polarization of Fe_4N^<4)> is confirmed because of the negative spin polarization of Fe_30_4^<6)>.
- 社団法人日本磁気学会の論文
- 2007-03-01
著者
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Irie K.
Department of Food Science, Shimane Prefectural Shimane Women's College
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Uehara M.
Department of Physics, Saga University
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Honma K.
Department Of Physics Faculty Of Engineering Graduate School Of Yokohama National University
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Kimishima Y.
Department of Physics, Faculty of Engineering, Graduate School of Yokohama National University
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Matsuo M.
Department of Physics, Faculty of Engineering, Graduate School of Yokohama National University
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Homma K.
Department of Physics, Faculty of Engineering, Graduate School of Yokohama National University
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Kimishima Y.
Department Of Physics Faculty Of Engineering Graduate School Of Yokohama National University
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Irie K.
Department Of Physics Faculty Of Engineering Graduate School Of Yokohama National University
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Homma K.
Department Of Physics Faculty Of Engineering Graduate School Of Yokohama National University
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