Morphological and microstructural study of L10-ordered FePt and L10-FePt/Fe ultrathin films grown by UHV e-beam evaporation technique |
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| Authors: | M Carbucicchio R Ciprian G Palombarini |
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| Institution: | 1. Department of Physics, University of Parma, Parma, Italy;2. Department of Metals Science, Electrochemistry and Chemical Techniques, University of Bologna, Bologna, Italy;1. Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, People''s Republic of China;2. Key Laboratory for Special Function Materials and Structural Design of the Ministry of the Education, Lanzhou University, Lanzhou 730000, People''s Republic of China;1. Department of Materials Science and Engineering, University of Ioannina, 45110 Ioannina, Greece;2. Department of Physics, University of Ioannina, 45110 Ioannina, Greece;3. Institute of Microelectronics-NCSR Demokritos, Aghia Paraskevi 15310, Greece;4. Department of Physics, Alexandru Ioan Cuza University, 700506 Iasi, Romania;1. School of Science and Key Laboratory for Solid State Microstructure of Jiangxi Province, Jiujiang University, 332005, China;2. Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, Faculty of Science, Tianjin University, Tianjin 300072, China;1. Shenzhen Key Laboratory of Special Functional Materials, Shenzhen University, Shenzhen 518060, China;2. College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China;3. Shenzhen Engineering Laboratory for Advanced Technology of Ceramics, Shenzhen 518060, China;1. Centro S3, Istituto Nanoscienze, Consiglio Nazionale delle Ricerche, via G. Campi 213/A, 41125 Modena, Italy;2. Istituto dei Materiali per l’Elettronica ed il Magnetismo, Consiglio Nazionale delle Ricerche, Parco Area delle Scienze 37/A, 43124 Parma, Italy;3. Dipartimento di Fisica, Università di Modena e Reggio Emilia and Centro S3, Istituto Nanoscienze, Consiglio Nazionale delle Ricerche, via G. Campi 213/A, 41125 Modena, Italy |
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| Abstract: | Ultrathin films of L10-ordered FePt alloy with different thickness were grown by UHV e-beam evaporation technique. In this ultrathin regime, the increase of the thickness induces a strong improvement of the magnetic properties followed by a decrease of the grain size. Starting from these hard layers, FePt/Fe/FePt trilayers with different thickness of the outermost layer have been grown. The samples show a single-phase magnetic behaviour and a strong perpendicular anisotropy thanks to the exchange-coupling that established at the soft/hard interfaces. By increasing the thickness of the outer layer, a strong reduction of the switching field distribution has been obtained with the appearance of a predominant exchange-type interaction among the magnetic grains. The morphology is characterized by well separated and elongated islands, while the magnetic pattern shows finely dispersed bubble domains. |
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