Title :
Electric Tuning of Ferromagnetic Resonances in Hexagonal-Barium-Ferrite/Barium-Strontium-Titanate Heterostructures
Author :
Young-Yeal Song ; Das, J. ; Krivosik, Pavol ; Hyung-Kee Seo ; Mingzhong Wu
Author_Institution :
Dept. of Phys., Colorado State Univ., Fort Collins, CO, USA
fDate :
7/2/1905 12:00:00 AM
Abstract :
This letter reports the first demonstration of a monolithic heterostructure with a large electric tuning of the ferromagnetic resonance (FMR) at millimeter-wave frequencies. The structure is composed of a barium-strontium-titanate (BST) film and two thin platinum electrodes, all grown on a barium ferrite slab with in-plane uniaxial anisotropy. The electric tuning of the FMR responses around 60 GHz was obtained for bias voltages across the BST layer in the 0-30 V range. The average tuning rate was 1.1 MHz/V. The highest incremental response was 2.1 MHz/V. These rates are significantly higher than the previously reported values for nonmonolithic structures.
Keywords :
barium compounds; ferrites; ferromagnetic materials; ferromagnetic resonance; magnetic anisotropy; magnetic thin films; strontium compounds; BST film; BaFe12O19-Ba0.5Sr0.5TiO3; barium ferrite slab; bias voltages; electric tuning; ferromagnetic resonances; hexagonal barium ferrite-barium strontium titanate heterostructures; in-plane uniaxial anisotropy; millimeter-wave frequencies; monolithic heterostructure; thin platinum electrodes; tuning rate; voltage 0 V to 30 V; Anisotropic magnetoresistance; Barium; Binary search trees; Electrodes; Ferrite films; Frequency; Magnetic resonance; Platinum; Slabs; Tuning; Magneto-electronics; barium strontium titanate; ferromagnetic resonance; heterostructures; hexagonal ferrite; millimeter wave; multiferroics;
Journal_Title :
Magnetics Letters, IEEE
DOI :
10.1109/LMAG.2010.2056357
