All-optical helicity-independent switching state diagram in GdFeCo alloys

Abstract

Ultra-fast magnetization switching induced by a single femtosecond laser pulse, under no applied magnetic field has attracted a lot of attention during the last 10 years because of its high potential for low energy and ultra-fast memory applications. Single-pulse helicity-independent switching has mostly been demonstrated for Gd based materials. It is now important to optimize the pulse duration and the energy needed to switch a GdFeCo magnet depending on the alloy thickness, concentration. Here we experimentally report state diagrams showing the magnetic state obtained after one single pulse depending on the laser pulse duration and fluence for various GdFeCo thin films with different compositions and thicknesses. We demonstrate that these state diagrams share similar characteristics: the fluence window for switching narrows for longer pulse duration and for the considered pulse duration range the critical fluence for single pulse switching increases linearly as a function of the pulse duration while the critical fluence required for creating a multidomain state remains almost constant. Calculations based on the atomistic spin model qualitatively reproduce the experimental state diagrams and their evolution. By studying the effect of the composition and the thickness on the state diagram, we demonstrated that the best energy efficiency and the longest pulse duration for switching are obtained for concentration around the magnetic compensation.

References in corpus (10)

• Atomistic spin model simulations of magnetic nanomaterials
• Thermally assisted magnetization reversal in the presence of a spin-transfer torque
• Current-induced magnetization switching in atom-thick tungsten engineered perpendicular magnetic tunnel junctions with large tunnel magnetoresistance
• Electric field control of nonvolatile four-state magnetization at room temperature
• Magnetization switching by ultrashort acoustic pulses
• Two magnon bound state causes ultrafast thermally induced magnetisation switching
• Blueprint for deterministic all-optical switching of magnetization
• The role of electron and phonon temperatures in the helicity-independent all-optical switching of GdFeCo
• Gilbert damping phenomenology for two-sublattice magnets
• Strain-induced magnetization control in an oxide multiferroic heterostructure

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• Laser induced ultrafast Gd 4f spin dynamics in Co100-xGdx alloys by means of time-resolved XMCD
• Single-Shot Magnetization Reversal in Ferromagnetic Spin Valves Enabled via Heat Control
• Low-energy, ultrafast spin reorientation at competing hybrid interfaces with tunable operating temperature
• Integrated magneto-photonic non-volatile multi-bit memory