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MA: Magnetismus
MA 7: Magnetische dünne Schichten II
MA 7.2: Talk
Friday, March 4, 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.