Berlin 2005 – wissenschaftliches Programm

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MA: Magnetismus

MA 7: Magnetische dünne Schichten II

MA 7.2: Vortrag

Freitag, 4. März 2005, 15:30–15:45, TU H1012

Epitaxial Sm-Co thin films with uniaxial in-plane anisotropy — •Aarti Singh¹, Roland Tamm², Volker Neu¹, Sebastian Fähler¹, Ludwig Schultz¹, Werner Skrotzki², and Bernhard Holzapfel¹ — ¹IFW Dresden, Helmholtzstr. 20, 01069 Dresden — ²Institut für Kristallographie und Festkörperphysik, TU Dresden, 01062 Dresden

This contribution reports on the epitaxial growth of Sm-Co films on MgO single crystal substrates with (100) and (110) orientation. The films were deposited with pulsed laser deposition. A thin layer of Cr was used as buffer and cover layer. On MgO(100) at deposition temperatures of 400 ^∘C, the films have an in-plane texture and have their c-axis oriented only along the MgO[100] and MgO[010] with MgO(001)[100] || Cr(001)[110] || SmCo(1120)[001]. Coercivities of the order of 2.7 T are obtained on these substrates. Varying the film composition leads to strongly increased magnetisation values while the crystallographic texture and the coercivity remain almost constant. On MgO(110) single crystal substrates, Sm-Co grows with the epitaxial relation MgO(110)[001] || Cr(211)[110] || SmCo(1010)[001]. This restricts the c-axis of the Sm-Co to grow with only one orientation on the substrate. The buffer (Cr) microstructure and texture are important in controlling the texture of the Sm-Co layer. For optimised conditions highly anisotropic films with coercivities of more than 3 T have been deposited.