Influence of a transverse static magnetic field on the magnetic hyperthermia properties and high-frequency hysteresis loops of ferromagnetic FeCo nanoparticles

TL;DR

This study investigates how a transverse static magnetic field affects the heating efficiency and hysteresis behavior of ferromagnetic FeCo nanoparticles used in magnetic hyperthermia, revealing that even a small static field can suppress heating.

Contribution

It demonstrates experimentally and through simulations that a static magnetic field of 40 mT can eliminate hyperthermia heating in FeCo nanoparticles, challenging the feasibility of magnetic hyperthermia within MRI environments.

Findings

A 40 mT static magnetic field cancels nanoparticle heating.

Simulations confirm experimental suppression of hysteresis losses.

Results question the use of hyperthermia in MRI settings.

Abstract

The influence of a transverse static magnetic field on the magnetic hyperthermia properties is studied on a system of large-losses ferromagnetic FeCo nanoparticles. The simultaneous measurement of the high-frequency hysteresis loops and of the temperature rise provides an interesting insight into the losses and heating mechanisms. A static magnetic field of only 40 mT is enough to cancel the heating properties of the nanoparticles, a result reproduced using numerical simulations of hysteresis loops. These results cast doubt on the possibility to perform someday magnetic hyperthermia inside a magnetic resonance imaging setup.