Magnetostriction Behaviors of Single- and Poly-Crystalline Ni/Ni-Co Bi-Layer Films

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  • Serizawa K.
    Faculty of Engineering, Yokohama National University Faculty of Science and Engineering, Chuo University
  • Ohtake M.
    Faculty of Engineering, Yokohama National University
  • Kawai T.
    Faculty of Engineering, Yokohama National University Faculty of Science and Engineering, Chuo University
  • Futamoto M.
    Faculty of Science and Engineering, Chuo University
  • Kirino F.
    Graduate School of Fine Arts, Tokyo University of the Arts
  • Inaba N.
    Faculty of Engineering, Yamagata University

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<p>  Ni(tNi nm)/Ni50Co50(100–tNi nm) bi-layer films are prepared on Cu/Pd/MgO(001) single-crystal substrates at 300 ℃ and on Cu/Pd/glass substrates at room temperature by varying the layer thickness, tNi, in a range of 0–100 nm. The effect of layer thickness ratio on the magnetostriction is investigated. As tNi value increases from 0 to 100 nm, the magnetostriction coefficient observed for single-crystal film along fcc[100], λ100, monotonically decreases from a positive value of +1 × 10–4 (tNi = 0 nm) to a negative value of –6 × 10–5 (tNi = 100 nm), whereas that measured along fcc[111], λ111, remains almost similar (–4 × 10–5 to –2 × 10–5). The magnetostriction coefficient of poly-crystalline film decreases from –3 × 10–6 to –2 × 10–5 with increasing tNi value from 0 to 100 nm. The present study has shown that control of magnetostriction coefficient is possible by combining materials with positive and negative coefficients.</p>

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