The effects of intraparticle structure and interparticle interactions on the magnetic hysteresis loop of magnetic nanoparticles

Technologically relevant magnetic nanoparticles for biomedicine are rarely noninteracting single-domain nanoparticles; instead, they are often interacting, with complex physical and magnetic structures. In this paper, we present both experimental and simulated magnetic hysteresis loops of a system of magnetic nanoparticles with significant interparticle interactions and a well-defined intraparticle structure which are used for magnetic nanoparticle hyperthermia cancer treatment. Experimental measurements were made at 11K on suspensions of magnetic nanoparticles dispersed in H2O which have been frozen in a range of applied magnetic fields to tune the interparticle interactions. Micromagnetic simulations of hysteresis loops investigated the roles of particle orientation with respect to the field and of particle chaining in the shape of the hysteresis loops. In addition, we present an analysis of the magnetic anisotropy arising from the combination of magnetocrystalline and shape anisotropy, given the well-defined internal structure of the nanoparticles. We find that the shape of the experimental hysteresis loops can be explained by the internal magnetic structure, modified by the effects of interparticle interactions from chaining.

Title	The effects of intraparticle structure and interparticle interactions on the magnetic hysteresis loop of magnetic nanoparticles
Creator	Dennis, C. L.
	Boekelheide, Zoe
	Gruttner, C.
	Miller, J. T.
Publisher	Journal of Applied Physics
Academic Department	Physics
Division	Natural Sciences
Organization	Lafayette College
Date Issued	July 2019
Date Available	2020-07-01
Type	Article
Language	English
Bibliographic Citation	Boekelheide, Z., et al. (2019 July) "The effects of intraparticle structure and interparticle interactions on the magnetic hysteresis loop of magnetic nanoparticles." Journal of Applied Physics 126 (4): 043903.
Standard Identifier	Handle 10385/ks65hc698
Permalink	http://hdl.handle.net/10385/ks65hc698
Rights Statement	In Copyright
Rights Holders	Dennis, C. L.
	Boekelheide, Zoe
	Gruttner, C.
	Miller, J. T.