Magnetic Fingerprints of sub-100 nm Fe Nanodots

Details Magnetic Fingerprints of sub-100 nm Fe Nanodots Magnetic Fingerprints of sub-100 nm Fe Nanodots

2007-04-02

arxiv.org/abs/0704.0127v1

Phys. Rev. B 75, 134405 (2007).

Physics

Condensed Matter

Materials Science

19 pages, 4 figures, to appear in PRB

Scientific paper

10.1103/PhysRevB.75.134405

Sub-100 nm nanomagnets not only are technologically important, but also exhibit complex magnetization reversal behaviors as their dimensions are comparable to typical magnetic domain wall widths. Here we capture magnetic "fingerprints" of 1 billion Fe nanodots as they undergo a single domain to vortex state transition, using a first-order reversal curve (FORC) method. As the nanodot size increases from 52 nm to 67 nm, the FORC diagrams reveal striking differences, despite only subtle changes in their major hysteresis loops. The 52 nm nanodots exhibit single domain behavior and the coercivity distribution extracted from the FORC distribution agrees well with a calculation based on the measured nanodot size distribution. The 58 and 67 nm nanodots exhibit vortex states, where the nucleation and annihilation of the vortices are manifested as butterfly-like features in the FORC distribution and confirmed by micromagnetic simulations. Furthermore, the FORC method gives quantitative measures of the magnetic phase fractions, and vortex nucleation and annihilation fields.

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