کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1616903 1005672 2011 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Microstructure and thickness dependent magnetic properties of nanogranular Co–Zn–O thin films for microwave applications
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Microstructure and thickness dependent magnetic properties of nanogranular Co–Zn–O thin films for microwave applications
چکیده انگلیسی

Co-based granular thin films with in-plane anisotropy were deposited on Si substrate by magnetron sputtering. The films have a phase structure of Co nanocrystallites and amorphous Zn–O inter-granular phases. The Co nanograins with uniform size of 8–10 nm are evenly distributed in the amorphous matrix. This structure gives the films relatively high resistivities. The as-deposited films with thickness larger than 100 nm have low coercivity (<10 Oe) along both easy and hard directions. The dynamic properties in the frequency range up 5 GHz for the films with various thicknesses have been investigated. High values of permeability (μ′ up to 560 and μ″ up to 1000) and ferromagnetic resonance frequency (FMR) up to 4.1 GHz have been obtained in these films. The FMR frequency decreases with increasing thickness, because of the increases in real and imaginary permeabilities. The high frequency characteristics have complicated dependences on the resistivity, anisotropy field, and magnetization. The microwave properties of Co–Zn–O films can be adjusted in a relatively wide range by changing film thickness, which makes these films promising for absorber applications.


► Co–Zn–O films have a Co nanograins + Zn–O amorphous inter-granular phase structure.
► The films have excellent in-plane magnetic anisotropy and high electric resistance.
► The real and imaginary permeabilities and FMR strongly depend on film thickness.
► FMR can be adjusted between 3.3 and 4.1 GHz by changing thickness (405-25 nm).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 509, Issue 41, 13 October 2011, Pages 10075–10079
نویسندگان
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