Acoustic-domain resonance mode in magnetic closure-domain structures: A probe for domain-shape characteristics and domain-wall transformations

作者：Hengst Claudia^*; Wolf Manfred; Schaefer Rudolf; Schultz Ludwig; McCord Jeffrey

来源：Physical Review B, 2014, 89(21): 214412.

DOI：10.1103/PhysRevB.89.214412

The magnetic-domain resonance was studied for varying closure-domain structures in Co40Fe40B20 thin-film elements. A domain-shape anisotropy model was introduced, by which a significant increase of the acoustic-domain resonance frequency for decreasing domain width is predicted. We show that magnetic flux closure further increases the domain-width effect on the acoustic-domain resonance frequency. Furthermore, the domain resonance frequency is very sensitive to the effective width of the magnetic-domain walls due to dynamic dipolar interaction. The latter is quantified by calculating the dynamic wall width dependent dipolar fields. Domain-wall transitions in external magnetic fields manifest in either smooth or sudden resonance frequency changes, depending on the involved domain-wall types. Quantitative agreement between experimental and modeled data is obtained. Measuring the acoustic-domain resonance in small excitation fields therefore displays a method to analyze domain-wall instabilities and domain-wall interactions.

• 出版日期2014-6-13