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Magnetic Susceptibility Study of Sub-Pico-emu Sample Using a Micromagnetometer: An Investigation through Bistable Spin-Crossover Materials
- Magnetic Susceptibility Study of Sub-Pico-emu Sample Using a Micromagnetometer: An Investigation through Bistable Spin-Crossover Materials
- Kamara, S.; Tran, Q.-H.; Davesne, V.; Félix, G.; Salmon, L.; Kim, Kun Woo; Kim, Cheol Gi; Bousseksou, A.; Terki, F.
- DGIST Authors
- Kim, Kun Woo; Kim, Cheol Gi
- Issue Date
- Advanced Materials, 29(46)
- Article Type
- Article in Press
- Magnetic fields; Magnetic susceptibility; Experimental approaches; Experimental methods; Magneto resistive sensors; Self-generated magnetic fields; Self-magnetic fields; Spin crossover materials; Spin crossovers; Theoretical modeling; Magnetism
- 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 mm3, 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. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
- Wiley-VCH Verlag
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