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Helical magnets are emerging as a novel class of materials for spintronicsand sensor applications; however, research on their charge and spin transportproperties in a thin film form is less explored. Herein, we report thetemperature and magnetic field dependent charge transport properties of ahighly crystalline MnP nanorod thin film over a wide temperature range (2-350K). The MnP nanorod films of 100 nm thickness were grown on Si substrates at500 oC using molecular beam epitaxy. The temperature dependent resistivity dataexhibits a metallic behavior over the entire measured temperature range.However, large negative magnetoresistance of up to 12% is observed below 50 Kat which the system enters a stable helical (screw) magnetic state. In thistemperature regime, the MR(H,T) dependence seems to show a magnetic fieldmanipulated phase coexistence. The observed magnetoresistance is dominantlygoverned by the intergranular spin dependent tunneling mechanism. Thesefindings pinpoint a correlation between the transport and magnetism in thishelimagnetic system.

Emergence of Intergranular Tunneling Dominated Negative Magnetoresistance in Helimagnetic Manganese Phosphide Nanorod Thin Films