Regensburg 2019 – scientific programme

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MA: Fachverband Magnetismus

MA 44: Magnetic imaging (Experimental techniques)

MA 44.1: Talk

Thursday, April 4, 2019, 09:30–09:45, H53

Towards determining the spin axis of individual CoO nanoparticles — •David Bracher¹, Tatiana M. Savchenko¹, Martin Testa Anta², Veronica Salgueiriño², Frithjof Nolting¹, Martino Poggio³, and Armin Kleibert¹ — ¹Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland — ²Departamento de Física Aplicada, Universidade de Vigo, 36310, Vigo, Spain — ³Department of Physics and Astronomy, University of Basel, CH-4056 Basel, Klingelberstrasse 82, Switzerland

Antiferromagnetic materials at the nanoscale are of profound interest for spintronics devices, e.g. spin valves and magnetic random access memories etc. However, the absence of a stray field makes exploring nano-sized antiferromagnetically ordered system very challenging. Here, we use x-ray magnetic linear dichroism (XMLD) spectromicroscopy to investigate the chemical and magnetic properties of individual CoO/Co3O4 core- shell nanoparticles with a diameter of about 100 nm. Complementary high resolution scanning electron microscopy is used to correlate the morphology and the magnetic properties of individual nanoparticles. Temperature-dependent XMLD spectra of single nanoparticles indicate a reversible magnetic phase transition of the CoO core close to Néel temperature of bulk CoO. In addition we observe a pronounced orientation dependent XMLD signal of the nanoparticles. These observations reveal that nano-sized CoO/Co3O4 structures exhibit stable antiferromagnetic order with a preferred spin axis. Our approach paves the way towards characterization of nano-scaled antiferromagnetic spintronics devices.