Rectification of radio frequency current in giant magnetoresistance spin valve

Abstract

We report on a highly efficient spin diode effect in an exchange-biased spin-valve giant magnetoresistance (GMR) strips. In such multilayer structures, symmetry of the current distribution along the vertical direction is broken and, as a result, a non-compensated Oersted field acting on the magnetic free layer appears. This field, in turn, is a driving force of magnetization precessions. Due to the GMR effect, resistance of the strip oscillates following the magnetization dynamics. This leads to rectification of the applied radio frequency current and induces a direct current voltage $V_{DC}$. We present a theoretical description of this phenomenon and calculate the spin diode signal, $V_{DC}$, as a function of frequency, external magnetic field, and angle at which the external field is applied. A satisfactory quantitative agreement between theoretical predictions and experimental data has been achieved. Finally, we show that the spin diode signal in GMR devices is significantly stronger than in the anisotropic magnetoresistance permalloy-based devices.

10 pages, 8 figures

References in corpus (8)

• Spin-transfer-driven ferromagnetic resonance of individual nanomagnets
• Electrical detection of spin pumping due to the precessing magnetization of a single ferromagnet
• Microwave photovoltage and photoresistance effects in ferromagnetic microstrips
• Large cone angle magnetization precession of an individual nanomagnet with dc electrical detection
• Rectification of radio frequency current in ferromagnetic nanowire
• Spin-torque diode radio-frequency detector with voltage tuned resonance
• Broadband electrical detection of spin excitations in (Ga,Mn)As using a photovoltage technique
• Electrical rectification effect in single domain magnetic microstrips: a micromagnetics-based analysis

Cited by in corpus (1)

• Electric-field tunable spin waves in PMN-PT/NiFe heterostructure: experiment and micromagnetic simulations