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Ferromagnetism

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...

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A high-resolution frequency variable experimental setup for studying ferrofluids used in magnetic hyperthermia.

E E Mazon¹, E Villa-Martínez², A Hernández-Sámano¹

¹Centro Universitario de la Ciénega, Universidad de Guadalajara, Av. Universidad 1115, Col. Linda Vista, Ocotlán, Jalisco C.P. 47820, Mexico.

The Review of Scientific Instruments

|September 3, 2017

Summary

This study presents a new scanning system for measuring the specific absorption rate of ferrofluids using superparamagnetic nanoparticles. The system accurately determines power absorption density, crucial for applications involving magnetic nanoparticle heating.

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Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement

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Published on: November 7, 2017

Area of Science:

Materials Science
Nanotechnology
Biomedical Engineering

Background:

Ferrofluids containing superparamagnetic nanoparticles are increasingly used in biomedical applications, requiring precise characterization of their thermal properties.
Understanding the specific absorption rate (SAR) is critical for controlling heat generation in these applications.

Purpose of the Study:

To develop and validate a scanning system for measuring the specific absorption rate (SAR) of ferrofluids.
To analyze the dependence of power absorption density on magnetic field intensity and frequency.

Main Methods:

Design and construction of an induction heating device with a resonant inverter (up to 38 mT, 180-525 kHz).
Utilization of a variable capacitor for precise frequency selection (0.3-5 kHz/nF resolution).
Testing with synthetic iron oxide nanoparticles (10 ± 1 nm) in glycerol at 1% concentration, measuring temperature rise to determine SAR.

Main Results:

The induction heating device demonstrated good agreement between experimental performance and theoretical predictions for frequency and amplitude.
The system successfully measured temperature rise and calculated dissipated power density for ferrofluids.
The specific absorption rate was determined, providing insights into power absorption density variations.

Conclusions:

The developed scanning system is a suitable tool for studying ferrofluids and their specific absorption rate.
The system enables analysis of how power absorption density is influenced by magnetic field intensity and frequency.
This research contributes to the precise characterization of magnetic nanoparticle heating for various applications.