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Paper detail

Emergent magnetic state in (111)-oriented quasi-two-dimensional spinel oxides

We report on the emergent magnetic state of (111)-oriented CoCr2O4 ultrathin films sandwiched by Al2O3 in the quantum confined geometry. At the two-dimensional crossover, polarized neutron reflectometry reveals an anomalous enhancement of the total magnetization compared to the bulk value. Synchrotron x-ray magnetic circular dichroism (XMCD) demonstrates the appearance of long-range ferromagnetic ordering of spins on both Co and Cr sublattices. Brillouin function analyses further corroborates that the observed phenomena are due to the strongly altered magnetic frustration, manifested by the onset of a Yafet-Kittel type ordering as the new ground state in the ultrathin limit, which is unattainable in the bulk.

preprint2019arXivOpen access
Xiaoran LiuB. J. KirbyZhicheng ZhongYanwei CaoB. PalM. KareevS. MiddeyJ. W. FreelandP. ShaferE. ArenholzJ. Chakhalian
cond-mat.str-el
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Xiaoran LiuB. J. KirbyZhicheng ZhongYanwei CaoB. PalM. KareevS. MiddeyJ. W. FreelandP. ShaferE. ArenholzJ. Chakhalian

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