Enhanced stability and decreased size limit for magnetic vortex state in thin permalloy nanodisk by radial modulation of thickness
Source abstract
Abstract
AbstractMagnetization reversal in thin cylindrical nanodisks with radius between 20 and 100nmis investigated with particular emphasis to modulation of disk thickness. The nanodisk is kept 1nmthin at the center, whereas it gradually thickens to 21nmat the periphery. The thickness modulation stabilizes the vortex closure state as the ground state in nanodisk for radius as low as 20nm. An onion state appears at remanence during in-plane magnetization reversal. Nudged elastic band method verifies that the vortex state is highly stable in all the nanodisks. In the nanodisk of 100nmradius, the vortex state requires an energy of 2677kTto transit into onion state wherekTis thermal energy at room temperature. This stability however reduces with size of nanodisk and the smallest nanodisk of 20nmradius has to surpass an energy barrier of 120kTto topple over to onion state.Graphic abstract
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Magnetic properties of thin films · Characterization and Applications of Magnetic Nanoparticles · Theoretical and Computational Physics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (29)
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