Dynamic transverse susceptibility in Au-Fe-Au "nano-onions"
H. Srikanth, E. E. Carpenter, C. J. O'Connor (Advanced Materials, Research Institute, University of New Orleans)
TL;DR
This study employs RF transverse modulation via a TDO to investigate the dynamic magnetic susceptibility of Fe nanoparticles, revealing anisotropy effects and hysteresis properties relevant for nanomagnetic applications.
Contribution
It introduces a novel RF measurement technique using a TDO to analyze the dynamic susceptibility of ring-shaped Fe nanoparticles, providing insights into their magnetic anisotropy.
Findings
Large coercivity of 400 Oe below 52K
Susceptibility peaks at anisotropy fields
RF method effectively probes nanomagnetic anisotropy
Abstract
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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Taxonomy
TopicsMagnetic properties of thin films · Molecular Junctions and Nanostructures · Semiconductor materials and interfaces