کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5496694 1530545 2017 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Giant exchange bias and its angular dependence in Co/CoO core-shell nanowire assemblies
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک و نجوم (عمومی)
پیش نمایش صفحه اول مقاله
Giant exchange bias and its angular dependence in Co/CoO core-shell nanowire assemblies
چکیده انگلیسی
The exchange-bias field (HEB) and its angular dependence are systematically investigated in Co/CoO core-shell nanowire assemblies (∼15 nm in diameter and ∼200 nm in length) consisting of single-crystalline Co core and polycrystalline CoO shell. Giant exchange-bias field (HEB) up to 2.4 kOe is observed below a blocking temperature (TEB ∼150 K) in the aligned Co/CoO nanowire assemblies. It is also found that there is an angular dependence between the HEB and the applied magnetization direction. The HEB showed a peak at 30° between the applied field and the nanowire aligned direction, which may be attributed to the noncollinear spin orientations at the interface between the ferromagnetic core and the antiferromagnetic shell. This behavior is quantitatively supported by an analytical calculation based on Stoner-Wohlfarth model. This study underlines the importance of the competing magnetic anisotropies at the interface of Co/CoO core-shell nanowires.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters A - Volume 381, Issues 25–26, 12 July 2017, Pages 2092-2096
نویسندگان
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