Directing the orientational alignment of anisotropic magnetic nanoparticles using dynamic magnetic fields

Author:

Hoffelner Daniel12345,Kundt Matthias12345,Schmidt Annette M.12345,Kentzinger Emmanuel67895,Bender Philipp1011125,Disch Sabrina12345ORCID

Affiliation:

1. Department Chemie

2. Institut für Physikalische Chemie

3. Universität zu Köln

4. D-50939 Köln

5. Germany

6. Jülich Centre for Neutron Science JCNS

7. Peter Grünberg Institut PGI

8. JARA-FIT

9. D-52425 Jülich

10. Experimentalphysik

11. Universität des Saarlandes

12. D-66041 Saarbrücken

Abstract

The structure-directing influence of static and dynamic, i.e. rotating, magnetic fields on the orientational alignment of spindle-type hematite particles with a high aspect ratio is investigated. Structural characterization using electron microscopy and small-angle X-ray scattering confirms a nearly collinear particle arrangement with orientation of the main particle axis either parallel or perpendicular to the substrate as directed by the magnetic field geometry. The combination of large structural and magnetocrystalline anisotropies results in significantly different, strongly anisotropic magnetic properties of the assemblies revealed by directional magnetization measurements.

Funder

Verband der Chemischen Industrie

Publisher

Royal Society of Chemistry (RSC)

Subject

Physical and Theoretical Chemistry

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