Particle size controlled magnetic loss in magnetite nanoparticles in RF-microwave region

TL;DR

This study investigates how particle size and external magnetic fields influence the microwave absorption properties of magnetite nanoparticles, enabling tunable RF-microwave devices and applications like shielding and hyperthermia.

Contribution

It demonstrates control over magnetic loss properties in magnetite nanoparticles by adjusting particle size and magnetic field, advancing RF-microwave application design.

Findings

Frequency of ferrimagnetic resonance can be tuned.

Maximum absorption frequency is adjustable.

Reflection loss is controllable via particle size and magnetic field.

Abstract

Frequency dependant complex magnetic permeability is used to understand RF-microwave behaviour of magnetic nanoparticles in the frequency range 250 MHz to 3 GHz. The stable dispersions of Fe3O4 nanoparticles with mean size varying between 11 to 16 nm are prepared for this purpose. The effect of mean particle size and external static magnetic field over microwave absorption properties of magnetic fluid is studied. It is observed that frequency of ferrimagnetic resonance, frequency of maximum absorption, loss tangent and reflection loss (RL) can be controlled by modifying mean particle size and strength of applied external static magnetic field. This kind of study can be useful for radio-microwave devices like tunable attenuator, EM sheilder, and other applications like Hyperthermia.