Manipulation of magnetic properties by tunable magnetic dipoles in a ferromagnetic thin film
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Date
2017-03-21
Authors
Maity, Tuhin
Roy, Saibal
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Publisher
Institute of Electrical and Electronics Engineers (IEEE)
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Abstract
We demonstrate how a unique nanomodulation within a continuous ferromagnetic film can induce magnetic dipoles at predefined, submicrometer scale locations, which can tune the global magnetic properties of the film due to dipole-dipole interactions. Arrays of tunable magnetic dipoles are generated with in-plane and out-of-plane directions, which can be rotated in-plane within the three-dimensional (3-D) modulated structure of a continuous film. In-plane magnetic dipole rotation enables a methodology to control overall magnetic properties of a ferromagnetic thin film. Formation of magnetic dipoles and their tunability were studied in detail by magnetic force microscopy, high-resolution magnetic measurements, and micromagnetic simulation of a nanomodulated Ni45Fe55 alloy film. A pattern larger than a single magnetic domain would normally form a vortex in the remanent state. However, here the unique 3-D nanostructure prevents vortex formation due to the competition between in-plane and out-of-plane dipole-dipole interaction giving rise to a metastable state. Experimentally, at zero remanence, the magnetization goes through a transformation from a metastable to a stable state, where the dipole-dipole interaction depends on their geometrical arrangement. Thus, the magnetic properties of the continuous film can be varied by the proposed pattern geometry. A detail analytical study of the dipolar energy for the system agrees well with the experimental and simulated results.
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Keywords
Nanomagnetics , Magnetic anisotropy , Magnetic film , Nanoimprint lithography , Soft magnetic materials , Magnetostatics , Perpendicular magnetic anisotropy , Magnetic domains , Magnetic resonance imaging , Magnetostatic waves
Citation
Maity, T. and Roy, S. (2017) 'Manipulation of magnetic properties by tunable magnetic dipoles in a ferromagnetic thin film', IEEE Magnetics Letters, 8, 4105404 (4pp). doi:10.1109/LMAG.2017.2685585
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