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We present spin transport studies on a low-field, room-temperaturemagnetoelectric multiferroic polycrystalline$\text{Sr}_{3}\text{Co}_{2}\text{Fe}_{24}\text{O}_{41}$ (SCFO)|Ptheterostructure wherein a highly tunable transverse conical magnetic phase isresponsible for static and dynamic magnetoelectric coupling. We measuredangular dependence of spin Hall magnetoresistance (SMR) at constant magneticfields ($H$) in the range of 50 to 100 kOe. Application of field below thecritical value (2.5 kOe), yielded negative SMR and the $H$-evolution ofnormalized SMR exhibited a negative gradient. Further, an increase in the $H$resulted in the positive slope of normalized SMR Vs. $H$ and later at higher$H$ around 14 kOe, a crossover from negative to positive SMR was observed. Weemployed a simple model for estimating the equilibrium magnetic configurationand computed the SMR modulation at various values of $H$. We argue that thetilting of the cone is dominant and in turn responsible for the observed natureof SMR below 2.5 kOe while, the closing of the cone-angle is pronounced athigher fields causing a reversal in sign of the SMR from negative to positive.Importantly, SMR experiments revealed that a change in the helicity with areversal of the magnetic field has no influence on the observed SMR.Longitudinal spin Seebeck effect (LSSE) signal was measured to be 500 nV at 280K, under application of thermal gradient, $\Delta T = 23$ K and field, 60 kOe.The observed LSSE signal, originating from pure magnon spin current, showed asimilar $H$-dependent behavior as that of the magnetization of SCFO. Ourdetailed spin transport studies on polycrystalline SCFO|Pt heterostructuredemonstrate high tunability of the amplitude and the sign of the SMR,highlighting its potential for novel spintronic devices such as SMR-based spinvalves and voltage-controlled spin transport devices.

Highly tunable spin Hall magnetoresistance in room-temperature  magnetoelectric multiferroic,  $\text{Sr}_{3}\text{Co}_{2}\text{Fe}_{24}\text{O}_{41}|$Pt hybrids