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Epitaxial films of Co40Fe40B20 (further - CoFeB) were grown on Bi2Te3(001)and Bi2Se3(001) substrates by laser molecular beam epitaxy (LMBE) technique at200-400C. Bcc-type crystalline structure of CoFeB with (111) plane parallel to(001) plane of Bi2Te3 was observed, in contrast to polycrystalline CoFeB filmformed on Bi2Se3(001) at RT using high-temperature seeding layer. Therefore,structurally ordered ferromagnetic thin films were obtained on the topologicalinsulator surface for the first time. Using high energy electron diffraction(RHEED) 3D reciprocal space mapping, epitaxial relations of maincrystallographic axes for the CoFeB/ Bi2Te3 heterostructure were revealed. MOKEand AFM measurements showed the isotropic azimuthal in-plane behavior ofmagnetization vector in CoFeB/ Bi2Te3, in contrast to 2nd order magneticanisotropy seen in CoFeB/Bi2Se3. XPS measurements showed more stable behaviorof CoFeB grown on Bi2Te3 to the oxidation, in compare to CoFeB grown on Bi2Se3.XAS and XMCD measurements of both concerned nanostructures allowed calculationof spin and orbital magnetic moments for Co and Fe. Additionally, crystallinestructure and XMCD response of the CoFeB/BiTeI and Co55Fe45/BiTeI systems werestudied, epitaxial relations of main crystallographic axes were found, and spinand orbital magnetic moments were calculated.

Crystalline structure and XMCD studies of Co40Fe40B20 grown on Bi2Te3, BiTeI and Bi2Se3