کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1802691 | 1024602 | 2006 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Coherent vs. incoherent switching for elongated CoPt-O grains in high-anisotropy medium
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Coherent vs. incoherent switching for elongated CoPt-O grains in high-anisotropy medium Coherent vs. incoherent switching for elongated CoPt-O grains in high-anisotropy medium](/preview/png/1802691.png)
چکیده انگلیسی
In most micro-magnetic models, a coherent switching mode is assumed for magnetic grains in the media. In this paper, we use state-of-art perpendicular recording media to study the magnetic switching behavior at different temperatures. The temperature dependence of the coercive field is measured and used as an indication of the strength of the thermal activation. For the thinner samples, the normalized coercive field can be described by an Arrhenius-Néel Brown (ANB) model. This model suggests that coherent switching dominates in these samples. For the thicker films, the normalized coercive field and, hence, the switching volume does not increase with increasing thickness, indicating the existence of incoherent switching. For the particular CoPt-O alloy studied, the crossover from coherent to incoherent switching occurs at a thickness of about 21Â nm. For an average grain diameter of 7Â nm, this corresponds to a grain aspect ratio of 3.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 303, Issue 2, August 2006, Pages e261-e264
Journal: Journal of Magnetism and Magnetic Materials - Volume 303, Issue 2, August 2006, Pages e261-e264
نویسندگان
X.W. Wu, R.J.M. van de Veerdonk, B. Lu, D. Weller,