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Using resonant soft X-ray techniques we follow the magnetic behavior of astrained epitaxial film of CoCr2O4, a type-II multiferroic. The film is[110]-oriented, such that both the ferroelectric and ferromagnetic moments cancoexist in plane. X-ray magnetic circular dichroism (XMCD) is used inscattering and in transmission modes to probe the magnetization of Co and Crseparately. The transmission measurements utilized X-ray excited opticalluminescence from the substrate. Resonant soft X-ray diffraction (RSXD) wasused to study the magnetic order of the low temperature phase. The XMCD signalsof Co and Cr appear at the same ordering temperature Tc~90K, and are alwaysopposite in sign. The coercive field of the Co and of Cr moments is the same,and is approximately two orders of magnitude higher than in bulk. Through sumrules analysis an enlarged Co2+ orbital moment (m_L) is found, which canexplain this hardening. The RSXD signal of the (q q 0) reflection appears belowTs, the same ordering temperature as the conical magnetic structure in bulk,indicating that this phase remains multiferroic under strain. To describe theazimuthal dependence of this reflection, a slight modification is required tothe spin model proposed by the conventional Lyons-Kaplan-Dwight-Menyuk theoryfor magnetic spinels. Lastly, a slight increase in reflected intensity isobserved below Ts=27K when measuring at the Cr edge (but not at the Co edge).

Magnetic properties of strained multiferroic CoCr2O4: a soft X-ray study