Berlin 2018 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
MA: Fachverband Magnetismus
MA 42: Thin films – anisotropy
MA 42.8: Talk
Thursday, March 15, 2018, 11:30–11:45, EB 301
Structural and magnetic properties of thin Tm3Fe5O12 layers — •Oana Ciubotariu, Helmut Karl, and Manfred Albrecht — Institute of Physics, University of Augsburg, 86159 Augsburg
The extremely low Gilbert damping parameter and the insulating nature make Y3Fe5O12 (YIG) layers the best choice for spin-related experiments. However, nanometric YIG films exhibit in-plane magnetic easy axis due to strong shape anisotropy. Nonetheless, Tm3Fe5O12 (TmIG) has been reported to poses an out-of-plane magnetic easy axis when grown on Gd3Ga5O12 (GGG) or substituted GGG (SGGG) substrates [1, 2]. In order to obtain high quality iron garnets, besides optimizing the substrate temperature or the oxygen pressure during growth, the cooling down procedure to room temperature after deposition has to be addressed. Here, we present the effect of the cooling down procedure on the structural and magnetic properties of TmIG layers. 100-nm thick films are grown by pulsed laser deposition on SGGG (111) substrates at optimized substrate temperature and oxygen pressure. After deposition, slow and fast cooling procedures are implemented. The effect on the crystal structure is investigated by X-ray diffraction and on magnetic properties by SQUID-VSM. Although the crystalline structure showed no dependence, the magnetic properties are strongly influenced. [1] A. Quindeau et al., Adv. Electron. Mater. 2017, 3, 1600376; [2] M. Kubota et al., Journal of Magnetism and Magnetic Materials, 339 (2013) 63-70.