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Local Stiffness Effect on Ferromagnetic Response of Nanostructure Arrays in Stretchable Systems
Author(s) -
Challab Nabil,
Zighem Fatih,
Faurie Damien,
Haboussi Mohamed,
Belmeguenai Mohamed,
Lupo Pierpaolo,
Adeyeye Adekunle O.
Publication year - 2019
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201800509
Subject(s) - kapton , materials science , nanostructure , nanowire , ferromagnetic resonance , anisotropy , substrate (aquarium) , ferromagnetism , stiffness , magnetic field , magnetic anisotropy , permalloy , strain engineering , thin film , strain (injury) , nanotechnology , magnetization , composite material , condensed matter physics , optoelectronics , optics , layer (electronics) , silicon , polyimide , oceanography , physics , quantum mechanics , geology , medicine
The control of magnetoelastic effects in magnetic media, their improvement or even their minimization according to the intended applications is a current problem. In this work, the effect of the elastic strain on the magnetic properties of Ni 60 Fe 40 continuous films and nanowires deposited on Kapton® substrates has been investigated. For this purpose, piezoactuation mechanical tests are performed in situ with ferromagnetic resonance measurements. It has been observed that the continuous thin film and the array of nanowires exhibit distinct behaviors in the presence of an elastic strain field. Precisely, the induced magnetoelastic anisotropy is much less pronounced in the case of nanowires. This difference in behavior has been explained/investigated based on finite element simulations. These latter revealed that the average strain transmitted from flexible substrate to magnetic medium is less important in the case of nanowires compared to continuous film. This lack of strain transfer/transmission is related to the relative amount of free surface of the nanostructures combined with a strong mechanical contrast between Ni 60 Fe 40 and Kapton (viz., a deposit relatively much more stiffer than the substrate). This important effect can be exploited in the future by controlling and optimizing geometries of nanostructures.