Giant magnetoresistance and magnetothermopower in Co/Cu multilayers |
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| Affiliation: | 1. Department of Physics and Materials Research Laboratory, University of Illinois at Urbana / Champaign, 1110 W. Green St., Urbana, IL 61801, USA;2. IBM Almaden Research Center, 650 Harry Road, San Jose, CA 95120-6099, USA;1. Departamento de Física, Universidade Federal do Rio Grande do Norte, Natal, RN 59078-900, Brazil;2. Departamento de Física, Universidade Federal de Santa Maria, Santa Maria, RS 97105-900, Brazil;1. Department of Medicine, Division of Cardiology, Johns Hopkins University, Baltimore, MD, USA;2. Critical Care Medicine Department, National Institutes of Health, Bethesda, MD, USA;3. Department of Radiology, Division of Magnetic Resonance Research, Johns Hopkins University, Baltimore, MD, USA;4. Department of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, MD, USA;5. Department of Medicine, Division of Endocrinology, Diabetes and Metabolism, Johns Hopkins University, Baltimore, MD, USA;6. Department of Medicine, Division of Infectious Diseases, Johns Hopkins University, Baltimore, MD, USA;7. Department of Pathology, Johns Hopkins University, Baltimore, MD, USA;1. Department of Cardiology, the First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China;2. Department of Cardiology, Minzu Hospital of Guangxi Zhuang Autonomous Region, Nanning, Guangxi, China;3. Department of Cardiology, Wuhan Asia Heart Hospital, Wuhan, Hubei, China;1. Department of Physics, University of Birjand, P. O. Box 97175-615, Birjand, Iran;2. Department of Electrical Engineering, Technical Faculty of Ferdows, University of Birjand, Iran |
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| Abstract: | The thermopower (Seebeck coefficient, S) has been measured on a series of Co/Cu multilayers that exhibit giant negative magnetoresistance (GMR). Negative in zero applied field, S(H) increases in magnitude as the field is increased, approaching that of bulk Co. The change in S is inversely proportional to the resistance of the sample which is, in turn, proportional to the square of the magnetization. A model is presented that yields both the GMR and S(H) from the spin-split density of states of the Co without the need of a spin-dependent scattering potential at the interfaces. |
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