Self-consistent solution of magnetic and friction energy losses of a magnetic nanoparticle

Autor(en)

Santiago Helbig, Claas Abert, Pedro A. Sánchez, Sofia S. Kantorovich, Dieter Suess

Abstrakt

We present a simple simulation model for analysing magnetic and frictional losses of magnetic nano-particles in viscous fluids subject to alternating magnetic fields. Assuming a particle size below the single-domain limit, we use a macrospin approach and solve the Landau-Lifshitz-Gilbert equation coupled to the mechanical torque equation. Despite its simplicity the presented model exhibits surprisingly rich physics and enables a detailed analysis of the different loss processes depending on field parameters and initial arrangement of the particle and the field. Depending on those parameters regions of different steady states emerge: a region with dominating N\'eel relaxation and high magnetic losses and another region region with high frictional losses at low fields or low frequencies. The energy increases continuously even across regime boundaries up to frequencies above the Brownian relaxation limit. At those higher frequencies the steady state can also depend on the initial orientation of the particle in the external field. The general behavior and special cases and their specific absorption rates are compared and discussed.

Organisation(en)

Computergestützte Physik und Physik der Weichen Materie, Physik Funktioneller Materialien, Forschungsplattform MMM Mathematics-Magnetism-Materials

Externe Organisation(en)

University of the Balearic Islands, Ural Federal University

Journal

Physical Review B

Band

107

Anzahl der Seiten

11

ISSN

2469-9950

DOI

https://doi.org/10.1103/PhysRevB.107.054416

Publikationsdatum

05-2022

Peer-reviewed

Ja

ÖFOS 2012

103017 Magnetismus

Schlagwörter

ASJC Scopus Sachgebiete

Electronic, Optical and Magnetic Materials, Condensed Matter Physics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/4f3a24bf-af44-49f5-8aed-bbc1c6f8eb39