Tunneling magnetoresistance effect in altermagnets

Altermagnetism, as a newly identified unconventional magnetic phase, has attracted great interest in condensed matter physics and provides a novel research platform for spintronics. Here, the authors theoretically study the tunneling magnetoresistance (TMR) effect and its transport properties in a universal altermagnetic sandwich device. They systematically investigate how the altermagnetic orientations affect the conductance and TMR ratio, together with the rich and intriguing underlying symmetry relations. This work introduces a new design perspective for the next-generation information and paves the way for the advancement of spintronics technologies.