Dynamic Radio-Frequency Transverse Susceptibility in Magnetic Nanoparticle Systems
L. Spinu, H. Srikanth, E. E. Carpenter, C. J. O'Connor (Advanced, Materials Research Institute, University of New Orleans)
TL;DR
This paper introduces a new RF resonant method using a tunnel-diode oscillator to measure the dynamic transverse susceptibility of Fe nanoparticle systems, revealing temperature-dependent magnetic relaxation behaviors.
Contribution
It presents a novel RF measurement technique for magnetic susceptibility in nanoparticle systems and analyzes temperature effects on magnetic relaxation processes.
Findings
Distinct peak structures in susceptibility at characteristic fields
Temperature influences the field dependence of susceptibility
Superparamagnetic behavior observed at high temperatures
Abstract
A novel resonant method based on a tunnel-diode oscillator (TDO) is used to study the dynamic transverse susceptibility in a Fe nanoparticle system. The magnetic system consists of an aggregate of nanometer-size core (Au)-shell (Fe) structure, synthesized by reverse micelle methods. Static and dynamic magnetization measurements carried out in order to characterize the system reveal a superparamagnetic behavior at high temperature. The field-dependent transverse susceptibility at radio-frequencies (RF), for different temperatures reveals distinct peak structure at characteristics fields (H_k, H_c) which changes with temperature. It is proposed that relaxation processes could explain the influence of the temperature on the field dependence of the transverse susceptibility on the MI.
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