Voltage assisted magnetic switching in Co50Fe50 interdigitated electrodes on piezoelectric substrates

Abstract

Estimation of spin transfer torque effect and thermal activation effect on magnetization reversal in Co Fe B ∕ Mg O ∕ Co Fe B magnetoresistive tunneling junctionsWe report on the properties of 10 nm thick Co 50 Fe 50 interdigitated electrodes deposited on lead zirconate titanate ͑PZT͒ substrates to achieve low power dynamic tuning of magnetic properties. The actuation of this combination relies on magnetoelectric coupling through the shear mode deformation of the PZT: numerical simulations confirmed that both uniaxial tensile and compressive strain can be achieved either by applying a bias voltage on the appropriate set of electrodes or by reversing the polarity of the bias voltage. Reversible electric field induced changes in the coercive field of more than 10% and a 0.08% change in the resistance were obtained for an applied electrical field of 5 kV/cm.

Recent Progress in Multiferroic Magnetoelectric Composites: from Bulk to Thin Films

“…Recently, the converse ME effect has been reported in some bulk ME composites. [62][63][64][65][66][67][68][69][70] Of interest, a class of electrostatically tunable inductors made of ME composite cores of Metglas/PZT/Metglas have been proposed. By applying electric fi elds, the permeability and anisotropy of metglas changes due to the strong converse ME coupling, thus tuning the inductance L and quality factor.…”

Voltage-induced modification in magnetic coercivity of patterned Co50Fe50 thin film on piezoelectric substrate

“…Previous works have been devoted to the voltagedriven control of magnetic anisotropy [6][7][8], resistivity modulation of a ferromagnet intimately contacted to a PE crystal [9] or textured FM nanoparticles embedded in a PE crystal [10]. Recently, a group from IMEC Leuven [11], developed a Co 50 Fe 50 /PE hybrid and achieved 10% change in coercivity and 0.08% in resistance, by low-power activation. Nowadays, materials which possess both ferroelectric and FM properties, multiferroics, are on the spotlight due to their great scientific interest and technological perspectives [13].…”

Nonvolatile, reversible electric-field controlled switching of remanent magnetization in multifunctional ferromagnetic/ferroelectric hybrids

“…[4][5][6][7][8][9] In such hybrids, the control of the key magnetic properties, such as coercive field, saturation magnetization, or remanent magnetization via electric voltages has been demonstrated recently. [10][11][12][13][14][15][16] A further major development is the demonstration of a reversible, all-electricfield control of magnetization orientation or reversal, and thus of an electrically controlled magnetization switching. [17][18][19][20][21][22][23][24][25][26] However, the literature so far is focused on a nonhysteretic all-electrical magnetization manipulation, i.e., the electricfield induced magnetization changes are volatile in the sense that they return to their initial state upon removing the electric field.…”