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Title: Critical analysis on nanostructured CoFeB synthetic orthogonal ferrimagnet

Critical analysis on the magnetic properties of synthetic ferrimagnet (SyF), Ta/MgO/CoFeB/Ru/CoFeB/MgO/Ta, is demonstrated via both static and dynamic techniques. With the Ru thickness being 2.3 nm, the coupling between two CoFeB layers becomes orthogonal, which can be used for spin-transfer-torque nano-oscillator (STNO). The fitting of angular dependent ferromagnetic resonance (FMR) allows the precise determination of magnetic anisotropy of each CoFeB layer, the relative magnetizations and the exchange field near the frequency of STNO applications. In addition, the mechanism of resonance broadening at out-of-plane direction is identified to be magnetic inhomogeneity by fitting the angular dependent linewidth of FMR spectra, which provides indispensable information for the future design of STNO devices.
Authors:
;  [1] ; ;  [2]
  1. Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan (China)
  2. Department of Physics, National Chung Cheng University, Chia-Yi 621, Taiwan (China)
Publication Date:
OSTI Identifier:
22306001
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ANISOTROPY; BORON COMPOUNDS; COBALT COMPOUNDS; FERRIMAGNETIC MATERIALS; FERROMAGNETIC RESONANCE; IRON COMPOUNDS; LAYERS; MAGNESIUM OXIDES; MAGNETIC PROPERTIES; MAGNETIZATION; NANOSTRUCTURES; OSCILLATORS; RUTHENIUM; SPECTRA; TANTALUM; TANTALUM OXIDES; TERNARY ALLOY SYSTEMS; THICKNESS; TUNGSTEN