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MA: Fachverband Magnetismus
MA 15: Magnetic Thin Films II
MA 15.1: Talk
Tuesday, March 8, 2016, 09:30–09:45, H33
Compositional tuning of boundary magnetization properties in epitaxial Cr2−xAlxO3 (0001) films — •Lorenzo Fallarino1, Christian Binek2, and Andreas Berger1 — 1CIC nanoGUNE, Donostia - San Sebastian, Spain — 2University of Nebraska, Lincoln, Nebraska, USA
The magnetoelectric antiferromagnet Cr2O3 (Chromia) is known to exhibit an equilibrium net magnetization at its (0001) surface [1]. This boundary magnetization (BM) can be exploited to switch the associated bulk antiferromagnetic order parameter solely by magnetic means in (0001) oriented thin Chromia films [2,3]. In order to investigate whether these BM properties can be extended to alloys containing different oxide materials, we investigated the effect of Al2O3 doping onto the structural and magnetic properties of Cr2O3. We fabricated a sample series of 100 nm thick epitaxial Cr2−xAlxO3 (0001) films in the concentration range x = 0 - 0.6. Using SQUID magnetometry, we demonstrated that the critical temperature TN of such alloy films can be tuned by using the BM as a probe to study the magnetic transition. Moreover, we evaluated the critical exponent and the absolute BM values for all the samples, which both corroborate the BM nature of the observed magnetic signals [4].
[1] K. D. Belashchenko, Phys. Rev. Lett. 105, 147204 (2010);
[2] L. Fallarino et al., Appl. Phys. Lett. 104, 022403 (2014);
[3] L. Fallarino et al., Phys. Rev. B 91, 054414 (2015);
[4] L. Fallarino et al., Phys. Rev. B 91, 214403 (2015);