What is spintronics and how is it useful? by SciToons (2019)
Source. Gives a good 1 minute explanation of tunnel magnetoresistance. Articles by others on the same topic
Tunnel magnetoresistance (TMR) is a quantum mechanical phenomenon observed in magnetic tunnel junctions (MTJs). These junctions consist of two ferromagnetic layers separated by a thin insulating barrier, typically only a few nanometers thick. TMR arises from the spin-dependent tunneling of electrons through this barrier.