Holographic imaging of interlayer coupling in Co-Pt-NiFeReport as inadecuate




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1 University of Exeter 2 SIMaP - Science et Ingénierie des Matériaux et Procédés 3 Diamond Light Source 4 ISIS 5 University of Leeds 6 ESRF - European Synchrotron Radiation Facility

Abstract : We present a method to determine the magnetic configuration of an in-plane magnetized permalloy layer using Fourier transform holography with extended references in an off-normal geometry. We use a narrow slit as an extended holographic reference to record holograms with the sample surface orthogonal to the incident x-ray beam, as well as rotated by 30° and 45° with respect to the beam. To demonstrate the sensitivity of the technique to in-plane magnetization, we present images of flux closed ground states in thin ∼50 nm permalloy elements, less than 1 μm in lateral size. Images of the in-plane domain pattern which is magnetostatically imprinted into a permalloy film by the stray fields generated by an adjacent Co-Pt multilayer were obtained. It is found that, whilst the domain patterns within the two magnetic layers show a strong resemblance at remanence within a pristine sample, the similarities disappear after the sample is exposed to a saturating magnetic field.





Author: Thomas A. Duckworth - Feodor Y. Ogrin - Guillaume Beutier - Sarnjeet S. Dhesi - Stuart A. Cavill - Sean Langridge - Amy Whiteside

Source: https://hal.archives-ouvertes.fr/



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