Dynamic transverse susceptibility in Au-Fe-Au "nano-onions"

Details Dynamic transverse susceptibility in Au-Fe-Au "nano-onions" Dynamic transverse susceptibility in Au-Fe-Au "nano-onions"

1999-04-19

arxiv.org/abs/cond-mat/9904267v1

Physics

Condensed Matter

Materials Science

PDF file, 4 pages, 5 figures, 1 color figure

Scientific paper

A precision radio-frequency (RF) transverse modulation technique based on a resonant tunnel diode oscillator (TDO) has been used to study the dynamic susceptibility in novel ring-shaped single domain Fe nanoparticles synthesized using reverse-micelle chemistry. Hysteresis loops measured using a SQUID magnetometer indicate a large coercivity (Hc = 400Oe) below the blocking temperature (TB ~52K). The dynamic susceptibility shows remarkable consistency with the M-H data and exhibits peaks at characteristic anisotropy fields. Overall, these RF experiments are well suited to probe the magnetic anisotropy in nanophase materials.

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