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2. Influence of the Cr and Ni concentration in CoCr and CoNi alloys on the structural and magnetic properties

Author

Thomas Hauet, Eric Aubry, Stéphane Mangin, Alain Billard, Alexandre Dekens, Tao Liu, Frederic Perry, Nipson Technology, Institut Jean Lamour (IJL), Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Études et de Recherches sur les Matériaux, les Procédés et les Surfaces (IRTES - LERMPS), Université de Technologie de Belfort-Montbeliard (UTBM)-Institut de Recherche sur les Transports, l'Energie et la Société - IRTES, Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) (FEMTO-ST), Université de Technologie de Belfort-Montbeliard (UTBM)-Ecole Nationale Supérieure de Mécanique et des Microtechniques (ENSMM)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS), PVDco Sarl, IMPACT N4S, ANR-15-IDEX-0004,LUE,Isite LUE(2015), Nipson S.A.S (NIPSON S.A.S., 28 RUE THIERRY-MIEG, BP 257, 90005 BELFORT, CEDEX, FRANCE), Nipson S.A.S., and Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
CoNi, Materials science, Magnetism, Annealing (metallurgy), Alloy, 02 engineering and technology, engineering.material, 01 natural sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, Condensed Matter::Materials Science, Magnetization, Nuclear magnetic resonance, Sputtering, CoCr, 0103 physical sciences, Semi-hard magnet, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, Anisotropy, Saturation (magnetic), [SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph], 010302 applied physics, Condensed matter physics, Demagnetizing field, [PHYS.MECA]Physics [physics]/Mechanics [physics], 021001 nanoscience & nanotechnology, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], engineering, 0210 nano-technology
Abstract

International audience; The crystalline and magnetic properties of micron thick magnetron sputtered Co1−x Crx and Co1−x Nix alloy films are analyzed in the view of their implementation as semi-hard magnets. All of the tested films crystallize in an hcp lattice, at least up to 35 at% of alloying elements (Cr or Ni). The structural study shows that the ratio of hcp phase with [0001] axis orientated perpendicular to the film as compared with in-plane orientation increases (resp. decreases), when Ni (resp. Cr) concentration increases independently of the post-annealing temperature. The orientation of the magnetization results from the competition between the demagnetization field which tends to align the magnetization in plane and the crystalline anisotropy which tends to maintain the magnetization along the [0001] axis. Interestingly, we find that, although Co and Ni are very similar atoms, Co1−x Nix alloys crystalline anisotropy can be strongly increased and reach up to twice the anisotropy of the best Co1−x Crx alloy, while maintaining a magnetization at saturation above 1200 kA/m. The thermal stability of the structural and magnetic properties of both alloys is demonstrated for an annealing temperature up to 300 °C.

Published
2017
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