TITLE

Impedance spectroscopy of micron sized magnetic tunnel junctions with MgO tunnel barrier

AUTHOR(S)
Ingvarsson, Snorri; Arikan, Mustafa; Carter, Matthew; Weifeng Shen; Gang Xiao
PUB. DATE
June 2010
SOURCE
Applied Physics Letters;6/7/2010, Vol. 96 Issue 23, p232506
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have studied the magnetoimpedance of micron sized magnetic tunnel junction sensors with 1.7 nm MgO tunnel barrier. We performed ac impedance spectroscopy in the frequency range between 100 Hz–40 MHz as a function of applied magnetic field in the sensing direction. We model our devices with a simple RLC circuit. Fitting the model to our data results in frequency independent R, L, and C, and our low frequency results are in agreement with dc measurements. Despite excellent agreement with published result on interface capacitance for MgO barrier magnetic tunnel junctions similar to ours we do not observe any magnetocapacitance in our devices.
ACCESSION #
51378906

 

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