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Electric-field Control of a Spin “bit” Configuration in MERAM Model: A Monte Carlo Study

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In this work, we have shown that the spin orientation in FM layer can be controlled by using the electrical field indirectly via the elastic mechanism between these layers. There is a critical electric field for each FM layer such as Fe, Fe3O4, which is the minimum electric field to switch the spin to the different directions in space. | VNU Journal of Science: Mathematics – Physics, Vol. 32, No. 2 (2016) 61-68 Electric-field Control of a Spin “bit” Configuration in MERAM Model: A Monte Carlo Study Tran Viet Dung1, Dang Dinh Long1, 2,* 1 2 VNU University of Engineering and Technology, 144 Xuan Thuy, Cau Giay, Hanoi, Vietnam International Centre for Theoretical Physics (ICTP), Strada Costiera, 11 I - 34151 Trieste, Italy Received 24 March 2016 Revised 15 May 2016; Accepted 30 June 2016 Abstract: Magnetoelectric (ME) effect can be realized in multiferroic composites composed of the alternative ferromagnetic (FM) and ferroelectric (FE) multilayer such as FM layer grown on top of FE layer (FM/FE). In this work, we have shown that the spin orientation in FM layer can be controlled by using the electrical field indirectly via the elastic mechanism between these layers. There is a critical electric field for each FM layer such as Fe, Fe3O4, which is the minimum electric field to switch the spin to the different directions in space. The Monte Carlo simulation has been applied for the anisotropy model taken into account the magnetocrystalline anisotropy and shape anisotropy as well as the effective anisotropy field. The particular spin switching, i.e. an angle of 90 degree switching, corresponding to bit “0” and “1” switching in magnetoelectric random access memory (MERAM) will be discussed. Keywords: magnetoelectric effect, multiferroic composites, electric-field control of magnetism, anisotropy model, Monte Carlo simulation, MERAM 1. Introduction∗ Figure 1. A model of FM/FE composite multiferroic heterostructure. _ ∗ Corresponding author. Tel.: 84-967598228 Email: longdd@gmail.com 61 62 T.V. Dung, D.D. Long / VNU Journal of Science: Mathematics – Physics, Vol. 32, No. 2 (2016) 61-68 Magnetoelectric (ME) effect [1, 2] has been a subject of interest for the physics community due to its variety of applications as well as the physics behind. One also observes a fascinating ME effect .