Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 3: Micro- and nanostructured Materials

MA 3.1: Vortrag

Montag, 7. März 2016, 09:30–09:45, H32

Mn_xGa_1−x Thin Films and Nanodots with High Coercivity and Perpendicular Magnetic Anisotropy — •Julie Karel¹, Francesca Casoli², Pierpaolo Lupo², Lucia Nasi², Federica Celegato³, Simone Fabbrici^2,4, Lara Righi^2,5, Paola Tiberto³, Franca Albertini², and Claudia Felser¹ — ¹Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — ²IMEM-CNR, Parma, Italy — ³INRIM, Electromagnetism Division, Turin, Italy — ⁴MIST E-R Laboratory, Bologna, Italy — ⁵Dipartimento di Chimica, Universita di Parma, Parma, Italy

Tetragonal Mn_xGa_1−x (x=0.70, 0.75) thin films exhibit perpendicular magnetic anisotropy with coercive fields between 1-2 T. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) reveal that 40nm samples grown at 300−350^∘C lead to films with the tetragonal c-axis oriented primarily perpendicular to the film plane but with some fraction of the sample exhibiting the c-axis in the film plane. Growth at 300^∘C with a reduced thickness or Mn concentration significantly decreases the tetragonal c-axis in the film plane. A Mn_0.7Ga_0.3 epitaxial thin film with perpendicular magnetic anisotropy and a large coercivity was patterned into nanodots using a self-assembly nanolithography procedure. The resulting nanodots retain the properties of the original film. Our results suggest this lithography procedure could be a promising direction for preparing spin valve devices.