کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1814779 1525251 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Critical fields of an exchange coupled two-layer composite particle
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Critical fields of an exchange coupled two-layer composite particle
چکیده انگلیسی
High-density recording systems require magnetic bits with perpendicular easy axis and large magnetocrystalline anisotropy to guarantee thermal stability. However, the large magnetic fields up to 10 T for the reversal of magnetization cannot be afforded by conventional write heads. Therefore, composite exchange coupled spring systems of soft and hard magnetic layers may be used to reduce the switching field. In this case the reversal of magnetization in general takes place in two steps: a nucleation process in the soft layer and a depinning process for the displacement of the domain wall at the phase boundary of the soft and the hard magnetic layer. The nucleation and depinning fields are determined on the basis of the continuum theory of micromagnetism. It is shown that the nucleation fields decrease according to a 1/L2 law with increasing thickness L of the soft layer and the depinning field of the charged Néel wall may be reduced by factors of 3-6 in comparison with the ideal nucleation field of the hard magnetic phase. One-step rectangular hysteresis loops are obtained for thicknesses of the soft layer smaller than the exchange length of the magnetostatic field.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 403, Issues 10–11, 1 May 2008, Pages 1854-1859
نویسندگان
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