Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 46: Magnetic Measurement Methods
MA 46.7: Vortrag
Donnerstag, 10. März 2016, 17:15–17:30, H33
All-Electric Access to the Magnetic-Field-Invariant Magnetization of Antiferromagnets — •Tobias Kosub1,2, Martin Kopte1,2, Oliver G. Schmidt1, and Denys Makarov1,2 — 1IFW Dresden, 01069 Dresden, Germany — 2Helmholtz-Zentrum Dresden-Rossendorf, 01239 Dresden, Germany
The rich physics of thin film antiferromagnets can be harnessed for prospective spintronic devices given that all-electric assessment of the tiny uncompensated magnetic moment is achieved. On the example of magnetoelectric antiferromagnetic Cr2O3, we prove that spinning-current anomalous Hall magnetometry serves as an all-electric method to probe the field-invariant uncompensated magnetization of antiferromagnets [1].
We obtain direct access to the surface magnetization of magnetoelectric antiferromagnets providing a read-out method for ferromagnet-free magnetoelectric memory. Owing to the great sensitivity, the technique bears a strong potential to address the physics of antiferromagnets in pristine environments. Exemplarily, we apply the method to access the criticality of the magnetic transition for a Cr2O3 thin film and we reveal the presence of field-invariant uncompensated magnetization even in 6-nm-thin IrMn films clearly distinguishing two contributions. This measurement technique is likely to advance the fundamental understanding of the anomalous Hall and magnetic proximity effects.
Supported by the EU FP7 (ERC Grant No. 306277) and the EU FET Programme (Grant No. 618083).
[1] T. Kosub et al., Phys. Rev. Lett. 115 097201 (2015).