Systematic studies of tunneling magnetoresistance in granular films made from well-defined Co clusters |
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| Institution: | 1. Department of Civil Engineering, Indian Institute of Technology, Roorkee 247667, India;2. Department of Civil Engineering, National Institute of Technology, Uttarakhand 246174, India;1. Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China;2. State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macao, China;3. College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao, China;1. Phenikaa Institute for Advanced Study and Faculty of Materials Science and Engineering, Phenikaa University, Yen Nghia, Ha-Dong District, Hanoi 10000, Viet Nam;2. Phenikaa Research and Technology Institute, A&A Green Phoenix Group, 167 Hoang Ngan, Hanoi 10000, Viet Nam;3. Department of Physics, University of Ulsan, Ulsan 680-749, Republic of Korea;4. Faculty of Engineering Physics and Nano-technology, VNU University of Engineering and Technology, 144 Xuan Thuy, Cau Giay, Hanoi 122000, Viet Nam;5. Center for Innovative Materials and Architectures (INOMAR), Vietnam National University, Ho Chi Minh City, Viet Nam;1. Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA;2. Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN 55455, USA |
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| Abstract: | The tunneling magnetoresistance (TMR) of granular films prepared by the co-deposition of well-defined ferromagnetic Co clusters and insulating inert-gas matrix atoms has been studied as function of matrix atoms (Kr, Xe), cluster volume fraction, temperature (4–40 K) and cluster size (4.2–5.2 nm). Tunneling samples with resistivities that differ by about five orders of magnitude have a TMR that is found to be independent of matrix and cluster volume fraction, i.e. is independent of both tunneling barrier height and width. All samples show a characteristic TMR(T)-dependence that can be explained by a model which takes into account that magnetic moments at the cluster surface are becoming misaligned with increasing temperature. The fraction of misaligned moments at a fixed temperature is increasing with decreasing clusters size. |
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