FeRhCrSi: Spin semimetal with spin-valve behavior at room temperature
Y. Venkateswara, Jadupati Nag, S. Shanmukharao Samatham, Akhilesh Kumar Patel, P. D. Babu, Manoj Raama Varma, Jayita Nayak, К. Г. Суреш, Aftab Alam
Abstract
FeRhCrSi shows unconventional magnetic and transport properties. It belongs to one of the rare spintronic material classes, namely, spin semimetals. Transport measurements reveal its semimetallic nature, which is further confirmed by $a\phantom{\rule{0}{0ex}}b$ $i\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}o$ calculations on the partially disordered L2${}_{1}$ structure, experimentally synthesized by the authors. The most striking feature is theasymmetric magnetoresistance variation with field at room temperature, clearly revealing spin-valve behavior. Disorder-induced ferrimagnetic regions within the ferromagnetic host are proposed to be the reason for this behavior. Simultaneous observation of spin semimetallic and spin valve features makes this alloy quite interesting both from fundamental and applied perspectives.