Straintronics-based magnetic tunneling junction: Dynamic and static behavior analysis and material investigation

Abstract

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Straintronics: A leap toward ultimate energy efficiency of magnetic random access memories

“…The required stress for eliminating the eB, called the critical stress, is shape and material dependent [9]. The elimination of the eB in a straintronics device is due to the magnetostrictive response of the free layer to the applied stress.…”

“…The elimination of the eB in a straintronics device is due to the magnetostrictive response of the free layer to the applied stress. A uniaxial stress v will manipulate the directional magnetic susceptibilities of the free layer [and, therefore, manipulate ( , )], Nsh i { reducing its parallel magnetic susceptibility || | while slightly increasing the perpendicular susceptibility , | = as predicted by [9], [15] , 1 || 0…”

“…The manipulation of the directional susceptibilities is highlighted in figure 6 for the sTJ with cobalt as the free layer. When the stress is high enough [9], the directional susceptibilities will favor the magnetization vector's settlement along the minor axis.…”

“…To maximize the energy efficiency, the amount of charge required to switch the state of the mTJ should be minimized. To this end, straintronics, as an alternative energy-efficient method to switch the state of the mTJ, was recently proposed [8], [9].…”

Electrical Writing of Magnetic and Resistive Multistates in CoFe Films Deposited Onto Pb[ZrxTi1-x]O3

“…The need of miniaturization of memory bits with the related quest of lowering the power consumption inspire scientific community for searching new ways of controlling magnetic states in spintronic logic devices (Binek and Doudin 2005;Bibes and Barthélémy 2008;Heron et al 2014). One of such possibility is to use strain as an additional degree of freedom in artificial magnetoelectric structures (Brandlmaier et al 2011;Brandlmaier et al 2012;Jia et al 2012;Roy et al 2012;Vaz 2012;Liu et al 2013;Roy 2013;Barangi and Mazumder 2014;Kundys et al 2014;Li et al 2014;Iurchuk et al 2014;Roy 2015). Straintronics (or strain controlled spintronics) is emerging as a new approach, aiming at strain-mediated control of spin dynamics in magnetic media.…”