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Magnetic Susceptibility Study of Sub‐Pico‐emu Sample Using a Micromagnetometer: An Investigation through Bistable Spin‐Crossover Materials
Author(s) -
Kamara Souleymane,
Tran QuangHung,
Davesne Vincent,
Félix Gautier,
Salmon Lionel,
Kim Kunwoo,
Kim CheolGi,
Bousseksou Azzedine,
Terki Ferial
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201703073
Subject(s) - bistability , materials science , spin crossover , crossover , condensed matter physics , spin (aerodynamics) , sample (material) , nanotechnology , optoelectronics , physics , thermodynamics , computer science , artificial intelligence
A promising and original method to study the spin‐transition in bistable spin‐crossover (SCO) materials using a magnetoresistive multiring sensor and its self‐generated magnetic field is reported. Qualitative and quantitative studies are carried out combining theoretical and experimental approaches. The results show that only a small part of matter dropped on the sensor surface is probed by the device. At a low bias‐current range, the number of detected nanoparticles depends on the amplitude of the current. However, in agreement with the theoretical model, the stray voltage from the particles is proportional to the current squared. By changing both the bias current and the concentration of particle droplet, the thermal hysteresis of an ultrasmall volume, 1 × 10 −4 mm 3 , of SCO particles is measured. The local probe of the experimental setup allows a highest resolution of 4 × 10 −14 emu to be reached, which is never achieved by experimental methods at room temperature.