Fast magnetization reversal of a magnetic nanoparticle induced by cosine chirp microwave field pulse

Abstract

We investigate the magnetization reversal of single-domain magnetic nanoparticle driven by the circularly polarized cosine chirp microwave pulse (CCMP). The numerical findings, based on the Landau-Lifshitz-Gilbert equation, reveal that the CCMP is by itself capable of driving fast and energy-efficient magnetization reversal. The microwave field amplitude and initial frequency required by a CCMP are much smaller than that of the linear down-chirp microwave pulse. This is achieved as the frequency change of the CCMP closely matches the frequency change of the magnetization precession which leads to an efficient stimulated microwave energy absorption (emission) by (from) the magnetic particle before (after) it crosses over the energy barrier. We further find that the enhancement of easy-plane shape anisotropy significantly reduces the required microwave amplitude and the initial frequency of CCMP. We also find that there is an optimal Gilbert damping for fast magnetization reversal. These findings may provide a pathway to realize the fast and low-cost memory device.

References in corpus (26)

• Spin torque switching with the giant spin Hall effect of tantalum
• The design and verification of Mumax3
• Current-driven Magnetization Reversal and Spin Wave Excitations in Co/Cu/Co Pillars
• Anatomy of Spin-Transfer Torque
• Modification of the Landau-Lifshitz Equation in the Presence of a Spin-Polarized Current in CMR and GMR Materials
• Switching of magnetization by non-linear resonance studied in single nanoparticles
• Thermally assisted magnetization reversal in the presence of a spin-transfer torque
• The Role of Spin-Dependent Interface Scattering in Generating Current-Induced Torques in Magnetic Multilayers
• Field dependence of magnetization reversal by spin transfer
• Current Induced Magnetization Switching in Small Domains of Different Anisotropies
• Direct Investigation of Superparamagnetism in Co Nanoparticle Films
• Fast magnetization switching of Stoner particles: A nonlinear dynamics picture
• Dynamical and thermal effects in nanoparticle systems driven by a rotating magnetic field
• Magnetization reversal in the anisotropy-dominated regime using time-dependent magnetic fields
• Interaction of a Nanomagnet with a Weak Superconducting Link
• Critical current under an optimal time-dependent polarization direction for Stoner particles in spin-transfer torque induced fast magnetization reversal
• Ratchet Effect in Magnetization Reversal of Stoner Particles
• Reversal of magnetization of a single-domain magnetic particle by the ac field of time-dependent frequency
• Optimal switching of a nanomagnet assisted by microwaves
• Critical current of spin transfer torque-driven magnetization dynamics in magnetic multilayers
• Autoresonant control of the magnetization switching in single-domain nanoparticles
• Microwave-assisted switching of a nanomagnet: analytical determination of the optimal microwave field
• Efficient Magnetization Reversal with Noisy Currents
• Euler equation of the optimal trajectory for the fastest magnetization reversal of nano-magnetic structures
• Subnanosecond magnetization reversal of magnetic nanoparticle driven by chirp microwave field pulse
• Thermally assisted magnetization reversal of a magnetic nanoparticle driven by a down-chirp microwave field pulse