Magnetization reversal and two level fluctuations by spin-injection in a ferromagnetic metallic layer

Abstract

Slow magnetic relaxation and two level fluctuations measurements under high current injection is performed in single-contacted ferromagnetic nanostructures. The magnetic configurations of the samples are described by two metastable states of the uniform magnetization. The current-dependent effective energy barrier due to spin-transfer from the current to the magnetic layer is measured. The comparison between the results obtained with Ni nanowires of 6 $\mu$m length and 60 nm diameter, and Co (10 nm)/Cu (10 nm)/Co(30 nm) nanometric pillars of about 40 nm in diameter refined the characterization of this effect. It is shown that all observed features cannot be reduced to the action of a current dependent effective field. Instead, all measurements can be described in terms of an effective temperature, which depends on the current amplitude and direction. The system is then analogous to an unstable open system. The effect of current induced magnetization reversal is interpreted as the balance of spin injection between both interfaces of the ferromagnetic layer.

9 pages, 8 figures

References in corpus (8)

• Enhanced Gilbert Damping in Thin Ferromagnetic Films
• Anatomy of Spin-Transfer Torque
• Mechanisms of spin-polarized current-driven magnetization switching
• Magnetization dynamics with a spin-transfer torque
• Thermally-Activated Magnetic Reversal Induced by a Spin-Polarized Current
• Quasi ballistic magnetization reversal
• Current-Induced Magnetization Reversal in High Magnetic Fields in Co/Cu/Co Nanopillars
• Effect of Antiferromagnetic Interlayer Coupling on Current-Assisted Magnetization Switching

Cited by in corpus (10)

• Thermally assisted magnetization reversal in the presence of a spin-transfer torque
• Current-Driven Magnetization Dynamics in Magnetic Multilayers
• Spin-transfer in an open ferromagnetic layer: from negative damping to effective temperature
• Non-collinear magnetic structures: a possible cause for current induced switching
• Magnetization reversal driven by spin-injection : a mesoscopic spin-transfer effect
• Spin Transfer from the point of view of the ferromagnetic degrees of freedom
• Chaotic Spin Dynamics of a Long Nanomagnet Driven by a Current
• Transfer of magnetization by spin injection between both interfaces of a Ni nanowire
• Current-induced asymmetric magnetoresistance due to energy transfer via quantum spin-flip process
• Application of Probabilistic-bit in Precision Measurements