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首页> 外文期刊>Physical review, B. Condensed matter and materials physics >Influence of spacer layer morphology on the exchange-bias properties of reactively sputtered Co/Ag multilayers
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Influence of spacer layer morphology on the exchange-bias properties of reactively sputtered Co/Ag multilayers

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We have studied the magnetic properties of Ag(t_(Ag))/Co(1.2 nm)_(60) multilayers grown in an oxygen atmosphere. Partial oxidation of the Co layers results in the appearance of r_(Ag) dependent exchange-bias properties. A strong increase in the exchange-bias field H_E together with a significant reduction in the coercivity H_C are observed when t_(Ag) is decreased below t_(Ag)~*=4 nm, whereas these two parameters adopt approximately constant values for t_(Ag) > t_(Ag) · At t_(Ag)~*, a transition from continuous to islandlike silver layers (on reducing t_(Ag)) is signaled by electrical resistivity and x-ray reflectivity results. From magnetic hysteresis loops recorded at room temperature and magnetization curves, it is concluded that this transition induces a granular morphology in the Co regions, which are previously (t_(Ag) > t_(Ag)~*) plateletlike, and enhances the oxidized fraction of Co (fcoo). The increase (decrease) in H_E (H_c) with reducing t_(Ag) below t_(Ag)* is correlated to the increase in both the electrical resistivity and f_(CoO) From the latter correlation, we infer that the higher degree of oxidation in the granular Co layers is associated with effectively thicker antiferromagnetic (CoO) regions than in the t_(Ag) > t_(Ag) (continuous multilayer) case—with correspondingly higher magnetic anisotropy energies—which may account for both the enhancement in H_E and the reduction in H_c. In addition, our study provides information on the surfactant effect of O_2 in Ag sputter growth since the continuity thickness value (t_(Ag)~*=4 nm) is found to be lower than those previously reported in nonreactive sputtering of Ag.

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