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|標題:||Structural and magnetic properties of ion-beam deposited NiFe/Co-oxide bilayers|
|期刊/報告no：:||European Physical Journal B, Volume 45, Issue 2, Page(s) 237-242.|
|摘要:||The structural and magnetic properties of NiFe/Co-oxide bilayers were studied. XRD investigation indicates the NiFe (Permalloy) layers ( a = 3.53 angstrom) grow with a ( 111) preferred orientation. The Co- oxide layers were fabricated with oxygen content in the deposition assist beam ranging from 8% (rocksalt CoO, a = 4.27 angstrom) to 34% ( spinel Co3O4, a = 8.21 angstrom). Both the coercivity H-c and exchange bias field Hex closely follow an inverse NiFe thickness relationship. A strong temperature dependence of Hc and H-ex is found in these NiFe/ Co- oxide bilayers. At T = 289 K, the NiFe/ CoO film exhibits an enhanced H-c relative to pure NiFe/ Co or NiFe/Co3O4 bilayers, an indication of exchange coupling between the NiFe and CoO phases. At T = 10 K, the NiFe/Co3O4. film exhibits an exchange-bias loop shift of H-ex similar to - 200 Oe that persists to temperatures greater than 30 K ( the Neel temperature of bulk Co3O4). The transition temperature of the Co3O4 film component has increased above the bulk value via exchange coupling with the permalloy. Results indicate that the exchange coupling interaction between FM and AFM layers are responsible for both enhanced coercivity and cross-tie domains.|
|Appears in Collections:||材料科學與工程學系|
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