Determination of demagnetizing factors using first-order reversal curves and ferromagnetic resonance
Source abstract
Abstract
We present a method to quantitatively analyze magnetizing or demagnetizing interactions in arrayed nano-magnets by combining first-order reversal curve (FORC) and ferromagnetic resonance (FMR) measurement data. We develop a function to predict the resulting FORC distribution given: (1) a Gaussian intrinsic distribution in terms of the internal field and (2) a mean interaction field proportional to the sample’s magnetic moment. We then perform least-squares regression of our model on experimental FORC measurements of a nanowire array and of a thin film. Combining the obtained interaction field with an FMR fit result allows us to algebraically solve for the effective axial and transverse demagnetizing factors. Our experimental demagnetizing factors agree with expected values and provide quantitative evidence of the demagnetizing interaction between nanowires in an array.
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Research context
OpenAlex topics: Magnetic properties of thin films · Magnetic Properties and Applications · Characterization and Applications of Magnetic Nanoparticles
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Affiliations
Department of Physics and Astronomy, San Jose State University , San Jose, California 95112, USA
References (31)
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