Study of domain structures in FeCo/TiZr multilayers by means of 3D neutron depolarisation |
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Institution: | 1. School of Material Science and Engineering, Northeastern University, Shenyang 110819, China;2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China;3. Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China |
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Abstract: | Multilayers of composition 60(Co68Fe31V1/Ti75Zr25) sputtered on Si wafers are studied by 3D neutron depolarisation analysis at glancing angles between −6.5° and 6.5°, both in zero and non-zero magnetic field. As the sample is rotated over a full turn in its plane, a 360° rather than 180° period is observed. This suggests that the magnetisation inside the CoFe sublayers is inclined by a few degrees out of the sample plane. Neighbouring FeCo sublayers cooperate by dipolar forces to form a structure of “inclined slab domains” with mutually antiparallel overall magnetisation. The thickness of these slabs includes 10–20 bilayers. In the hysteresis loop with the field parallel to the FeCo magnetisation a high remanence is found; when the field is (in-plane but) perpendicular to the FeCo magnetisation, the dipolar coupling is suppressed and a magnetisation loop with a lower remanence is observed. |
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