TY - JOUR

T1 - Self-consistent solution of magnetic and friction energy losses of a magnetic nanoparticle

AU - Helbig, Santiago

AU - Abert, Claas

AU - Sánchez, Pedro A.

AU - Kantorovich, Sofia S.

AU - Suess, Dieter

N1 - The authors wish to thank the “FWF - Der Wissenschaftsfonds” for funding under the Project No. P 33748 and the Vienna Scientific Cluster (VSC) for providing the necessary computational resources. We acknowledge financial support by the Vienna Doctoral School in Physics (VDSP). P.A.S. acknowledges support from the project “Computer modeling of magnetic nanosorbents”, funded by the University of the Balearic Islands and the European Regional Development Fund. This research has been partially performed in the framework of the RSF Project No.19-12-00209.

PY - 2023/2

Y1 - 2023/2

N2 - We present a simple simulation model for analyzing magnetic and frictional losses of magnetic nanoparticles 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 magnetic 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 viscous 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.

AB - We present a simple simulation model for analyzing magnetic and frictional losses of magnetic nanoparticles 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 magnetic 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 viscous 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.

UR - https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=tsmetrics&SrcApp=tsm_test&DestApp=WOS_CPL&DestLinkType=FullRecord&KeyUT=000943089300004

UR - http://www.scopus.com/inward/record.url?partnerID=8YFLogxK&scp=85149791779

U2 - 10.1103/PhysRevB.107.054416

DO - 10.1103/PhysRevB.107.054416

M3 - Article

VL - 107

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 5

M1 - 054416

ER -