Fingerprinting the magnetic behavior of antiferromagnetic nanostructures using remanent magnetization curves

Article

关键词: MESOPOROUS SILICA;    EXCHANGE BIAS;    HYSTERESIS ANOMALIES;    SPIN-GLASSES;    DATA-STORAGE;    NANOPARTICLES;    ANISOTROPY;    CO3O4;    SYSTEMS;    CR2O3;   

DOI  :  10.1103/PhysRevB.83.134424

来源: SCIE

【 摘 要 】

Antiferromagnetic (AF) nanostructures from Co(3)O(4), CoO, and Cr(2)O(3) were prepared by the nanocasting method and were characterized magnetometrically. The field-and temperature-dependent magnetization data suggests that the nanostructures consist of a core-shell structure. The core behaves as a regular antiferromagnet and the shell as a two-dimensional diluted antiferromagnet in a field (2DDAFF) as previously shown on Co(3)O(4) nanowires [M.J. Benitez et al., Phys. Rev. Lett. 101, 097206 (2008)]. Here we present a more general picture on three different material systems, i.e., Co(3)O(4), CoO, and Cr(2)O(3). In particular, we consider the thermoremanent (TRM) and the isothermoremanent (IRM) magnetization curves as fingerprints in order to identify the irreversible magnetization contribution originating from the shells. The TRM/IRM fingerprints are compared to those of superparamagnetic systems, superspin glasses, and 3D DAFFs. We demonstrate that TRM/IRM vs H plots are generally useful fingerprints to identify irreversible magnetization contributions encountered in particular in nanomagnets.

【 授权许可】

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