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. 2017 Apr 4;7:45493. doi: 10.1038/srep45493

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(a) Magnetization phase (field H_A > 0 Oe) where the MNP magnetic moments are aligned to the applied field. (b) Relaxation phase (field H_A = 0 Oe) where the MNP magnetic moments gradually randomize. (c) The corresponding resistance of an MR sensor in response to the external magnetic field with and without MNPs.