Abstract
Exchange bias in a magnetoelectric Cr2O3/ferromagnet system at finite temperature, based on the formation of a domain wall in Cr2O3, has been investigated using Monte Carlo simulation. It has been shown that the calculation of the exchange bias based on domain wall formation yields a more realistic value than that calculated using interfacial exchange coupling between Cr2O3 and the adjacent ferromagnet. Possible shortcoming of the magnetoelectric effect in setting the switchable exchange bias in the low temperature regime has also been demonstrated based on an energy threshold requirement. Specifically, it has been found that the magnetoelectric effect becomes intrinsically less effective in switching the exchange bias at low temperature, thus making the applicability of the system limited to only a certain temperature range.
Highlights
The requirement of ultra-low power dissipation in spintronic devices triggers the desire to move to voltage controlled switching elements in lieu of current controlled ones
Surface magnetization for up spin sites has been estimated by removing the down spins at the surface buckled Cr3+ layer as shown in FIG. 1(a). 24x24x36 Cr3+ sites have been considered for the Monte Carlo (MC) simulation
Magnetic properties of magnetoelectric chromia have been analyzed through MC simulation
Summary
The requirement of ultra-low power dissipation in spintronic devices triggers the desire to move to voltage controlled switching elements in lieu of current controlled ones. Simultaneous application of electric (E) and magnetic field (H) below Neel temperature (TN) favors one spin configuration over the opposite one due to the lift in degeneracy of the two configurations.[4,5] The applied field product EH determines the directionality of the BM and the EB of the adjacent FM.[5] The manipulation of the directionality has been utilized to achieve electric field dependent switching of the EB in systems with bulk and thin film chromia.[6,7,8]. The capability of the ME effect in determining the EB at any temperature below TN has been studied through estimation of the temperature dependent energy terms
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