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Nonlinear ferromagnetic resonance (NFMR) at the nanoscale differs from the same phenomenon in bulk magnetic samples due to the nanosize-related discreteness of the spin wave spectrum. Because of the spectrum discreteness, the conservation laws for multiwave parametric interaction processes cannot be fulfilled exactly and become nonresonant. The presence of the nonresonant parametric processes in a...
We propose an engineering model for determination of minimum detectable microwave power (MDMP) of a spin-torque microwave detector (STMD) connected to a standard 50-Ohm load. We obtain that the MDMP of a STMD can reach 10 nW at room temperature. The developed formalism can be used for the optimization of the practical parameters of various systems based on a STMD.
The theoretical analysis of influence of temperature on the resonant sensitivity and signal-to-noise ratio of a resonance-type spin-torque microwave detector (STMD) has been carried out. We reveal that the resonant sensitivity does not always improve with the decrease of temperature. The developed formalism can be used for the optimization of the practical parameters of a STMD in a wide range of temperatures.
We propose a novel mode of operation of a spin-torque microwave detector (STMD), based on excitation of large-angle out-of-plane (OOP) magnetization precession. We analyze the performance of a STMD in this mode and show that detector operates as a non-resonant broadband threshold microwave detector in a wide range of low frequencies.
The analysis of performance of a resonance-type spin-torque microwave detector (STMD) in the presence of noise has been carried out. It reveals the existence of two distinct modes of STMD operation. In the first (high-frequency) mode the minimum detectable microwave power Pmin is limited by the low-frequency Johnson-Nyquist noise and the signal-to-noise ratio (SNR) of STMD is proportional to the input...
In experimental microwave sources based on spin-torque magnetic nano-structures (MNS) the power is extracted as oscillation of the device magnetoresistance (MR). The goal of our work is to evaluate the magnitude of the microwave power that can be extracted from a MNS through the oscillating dipolar fields when the MNS is coupled to different microwave systems, and to compare this power with the power...
Theoretical investigation of possible application of microwave planar antennas for the development of telecommunication devices based on magnetic nano-structures (MNS) (spin-torque nano-oscillators) is presented. It is shown that coplanar antennas have some advantages in comparison with other types of antennas. The performance of the antennas in a frequency range 1-5 GHz is estimated, and it is shown...
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