کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1797987 1524807 2016 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mode coupling in spin torque oscillators
ترجمه فارسی عنوان
اتصال حالت در نوسان گشتاور اسپین
کلمات کلیدی
نوسانگر اسپین گشتاور
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
چکیده انگلیسی


• Deriving equations for coupled modes in spin torque oscillators.
• Including Hamiltonian formalism and elimination of three–magnon processes.
• Thermal bath of magnons central to mode coupling.
• Numerical examples of circular and elliptical devices.

A number of recent experimental works have shown that the dynamics of a single spin torque oscillator can exhibit complex behavior that stems from interactions between two or more modes of the oscillator, such as observed mode-hopping or mode coexistence. There has been some initial work indicating how the theory for a single-mode (macro-spin) spin torque oscillator should be generalized to include several modes and the interactions between them. In the present work, we rigorously derive such a theory starting with the Landau–Lifshitz–Gilbert equation for magnetization dynamics by expanding up to third-order terms in deviation from equilibrium. Our results show how a linear mode coupling, which is necessary for observed mode-hopping to occur, arises through coupling to a magnon bath. The acquired temperature dependence of this coupling implies that the manifold of orbits and fixed points may shift with temperature.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 414, 15 September 2016, Pages 227–242
نویسندگان
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