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BE: Beschleunigerphysik

BE 9: Synchrotron Radiation II (Focus Session with MI)

BE 9.4: Hauptvortrag

Mittwoch, 2. April 2014, 16:30–17:00, MOL 213

Nanomagnets and artificial multiferroics studied with X-ray photoemission electron microscopy — •Frithjof Nolting — Paul Scherrer Institut, Switzerland

Bringing different materials in contact at the nanoscale opens the door to improving or creating new functionalities by tuning the properties of the resulting interfaces. Employing photoemission electron microscopy (PEEM) and X-ray magnetic circular dichroism (XMCD) their magnetic properties can be studied. Using recent results I will explain the technique and its possibilities. One example is the study of the magnetic properties and scaling laws of nanoparticles, were we discovered a size-dependent transition from a single domain state to a non-collinear spin structure in isotropic nanoparticles with sizes ranging from 25 down to 5 nm [1]. A second example will be the demonstration of in situ 90 degree electric field-induced uniform magnetization rotation in single domain submicron ferromagnetic islands grown on a ferroelectric single crystal [2]. Further examples will be about patterned magnetic nanostructures and how the magnetization of ferromagnetic systems can be manipulated by ultrashort laser pulses studied with time resolved measurements [3].

[1]A. Fraile-Rodríguez et al. Phys. Rev. Lett. 104, 127201 (2010).

[2]M. Buzzi et al. Phys Rev. Lett. 111, 027204 (2013).

[3]L. Le Guyader et al. App Phys. Lett. 101, 022410 (2012).