Structural and magnetoresistive properties of half metallic Co2Mn1−xSi thin films |
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| Authors: | KB Li JJ Qiu P Luo LH An ZB Guo YK Zheng GC Han YH Wu SJ Wang |
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| Institution: | 1. Data Storage Institute, 5 Engineering Drive 1, Republic of Singapore, Singapore 117608, Singapore;2. Department of Electrical and Computer Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore;3. Institute of Materials Research and Engineering (IMRE), 3 Research Link, Republic of Singapore, Singapore 117602, Singapore |
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| Abstract: | Polycrystalline Co2Mn1−xSi (CMS) thin films with Mn-deficiency can grow on different types of substrates such as MgO (1 0 0) single crystal, α-sapphire (0 0 0 1) and Si coated with SiO2 either by using V or Ta/Cu as the seed layer. The magnetic property, especially the coercivity of the CMS thin films strongly depends on the crystalline structure and microstructure of the CMS thin film, hence it is affected by the substrate and also the seed layer. Very soft CMS thin film with coercivity of about 20 Oe has been obtained when MgO (1 0 0) is used as the substrate. Magnetic tunnel junctions (with MR ratio of about 9%–18%) by utilizing the CMS as one of ferromagnetic electrodes have been successfully fabricated. The degradation of the magnetoresistive effect of the MTJ after magnetic annealing is attributed to the diffusion of the Mn-atoms into the tunnel barrier during the annealing process. |
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| Keywords: | 75 70 Kw 75 60 Jk |
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