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We report on the spin-Hall magnetoresistance (SMR) and spin Seebeck effect(SSE) in multiferroic CoCr2O4 (CCO) spinel thin films with Pt contacts. Weobserve a large enhancement of both signals below the spin-spiral (Ts = 28 K)and the spin lock-in transitions (T_{lock_in} = 14 K). The SMR and SSE responsein the spin lock-in phase are one order of magnitude larger than those observedat the ferrimagnetic transition temperature (Tc = 94 K), which indicates thatthe interaction between spins at the Pt|CCO interface is more efficient in thenon-collinear magnetic state below Ts and T_{lock-in}. At T > Tc, magneticfield-induced SMR and SSE signals are observed, which can be explained by ahigh interface susceptibility. Our results show that the spin transport at thePt|CCO interface is sensitive to the magnetic phases but cannot be explainedsolely by the bulk magnetization.

Spin-Hall magnetoresistance and spin Seebeck effect in spin-spiral and paramagnetic phases of multiferroic CoCr2O4 films