کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8152709 1524756 2018 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Hetero-interface effect on Gilbert damping in nonmagnetic metal/permalloy/nonmagnetic metal trilayers
ترجمه فارسی عنوان
اثر ناسازگار رابطی در آرام سازی گیلبرت در ترانسفورماتورهای فلز غیر مغناطیسی / پرملوی / غیر مغناطیسی
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
چکیده انگلیسی
Gilbert damping in nonmagnetic metal (NM)/permalloy (Py)/nonmagnetic metal (NM) trilayers was studied using ferromagnetic resonance (FMR) measurements for different constituent materials (NM = Pt, Ta, Cu, and Ti) of varying Py thickness (t = 2, 3, 4, 5, 6, 8, and 10 nm) fabricated using an ultrahigh vacuum sputtering system. We found that the Gilbert damping constant increases with decreasing Py thickness and varies for different constituents of nonmagnetic metals. For NM = Pt, the damping constant of Py increases with decreasing Py thickness more remarkably than for other nonmagnetic metals. According to quantitative estimations of the effective spin-mixing conductance Geffmix, it was found that the value of Geffmix = 1.17 × 1015 Ω−1·m−2 for Pt is one order of magnitude greater than Geffmix = 0.13 × 1015 Ω−1·m−2 for Cu and 0.11 × 1015 Ω−1·m−2 for Ti. The large Geffmix value for Pt/Py/Pt is known to be caused by the strong spin-orbit coupling (SOC) of Pt. The effective spin-mixing conductance for Pt is 3 times greater than that (0.27 × 1015 Ω−1·m−2) for Ta despite the SOC of both Pt and Ta is similar in magnitude. This work allows not only for an understanding of the interface effect of the Gilbert damping constant on NM/Py/NM trilayers but also for optimal design of low-power-consumption spintronic devices that are composed of a variety of hetero-interfaces between the different magnetic and nonmagnetic layers.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 465, 1 November 2018, Pages 399-405
نویسندگان
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