A Novel Bar-Shaped Magnetic Shielding for Magnetoresistive Sensors in Current Measurement on Printed Circuit Boards

Session PF: Materials for Applications, abstract no. PF-02This paper presents the study of a novel bar-shaped magnetic shielding for magnetoresistive (MR) sensors in current measurement on printed circuit boards (PCB). The main physical principles of the shielding effect were studied by using the analytical model of magnetic flux concentration. Finite element analysis (FEA) simulations were used to simulate the shielding effects with changing geometrical parameters of the bar-shaped magnetic shielding. The dependences of the shielding effect on the parameters of length, width and thickness were analyzed. It shows that these parameters are critical for designing magnetic shielding. This new concept of magnetic shielding for MR sensors in current measurement on PCB was experimentally tested and verified in a laboratory setup. The experimental results verify the feasibility and effect of this novel magnetic shielding for MR sensors.published_or_final_versio

Performance Optimization of Spin-Torque Microwave Detectors with Material and Operational Parameters

published_or_final_versio

Skyrmion Domain Wall Collision and Domain Wall-Gated Skyrmion Logic

preprin

A Novel Approach for Fault Location of Overhead Transmission Line with Non-Contact Magnetic Field Measurement

published_or_final_versio

Injection locking of spin-torque nano-oscillators

This journal issue contain selected papers from the Asia-Pacific Data Storage Conference (APDSC'13)We demonstrated the phase locking of a spin-torque oscillator (STO) to an alternating current (ac) using macrospin and micromagnetic simulations. We found that the locking properties of both approaches agree with each other. The phase difference between the STO and the injected ac stabilizes at ∆φ ≈ 90° and is not sensitive to the initial phase difference, which provides potential application of STO for microwave generation.published_or_final_versio

Overhead High-Voltage Transmission-Line Current Monitoring by Magnetoresistive Sensors and Current Source Reconstruction at Transmission Tower

Session PF: Materials for ApplicationsThis paper proposes a novel current monitoring technology based on magnetic field sensing at a transmission tower for overhead high-voltage transmission lines (HVTLs), which can accurately measure phase current parameters in real time. This technology is based on the phenomenon that the magnetic field distribution at the top level of a transmission tower can reflect the operation states of the transmission lines including current amplitude and phase angle imbalances. A current source reconstruction method based on stochastic optimization strategy was developed to reconstruct the electrical parameters from the magnetic field emanated by the overhead transmission lines. This concept of current monitoring by magnetic field sensing and current source reconstruction was experimentally implemented and verified in our laboratory setup. A typical model of 500 kV three-phase transmission lines was simulated to further corroborate this technology. The reconstruction results for the 500 kV transmission lines verify the feasibility and practicality of this novel current monitoring technology based on magnetic field sensing at the top of a transmission tower for monitoring overhead transmission lines.published_or_final_versio

Efficient Communication of Sensors Monitoring Overhead Transmission Lines

published_or_final_versio

Magnetics in Smart Grid

This journal issue contain selected papers from the Asia-Pacific Data Storage Conference (APDSC'13)A revolution in power transmission and distribution, driven by environmental and economic considerations, is occurring all over the world. This revolution is spearheaded by the development of the smart grid. The smart grid is bringing profound change to both the power systems and many related industries. This paper reviews the development of the smart grid and its correlation with magnetics, including electromagnetic compatibility issue, magnetic-field-based measurement/monitoring, and magnetic energy storage/conversion. The challenge to the field of magnetics and the usage of the cutting edge magnetics technology in the development of the smart grid are discussed. This paper enables researchers in the magnetics community to be acquainted with the progress in the smart grid and inspires innovative applications of state-of-the-art magnetics technologies in the smart grid.published_or_final_versio

Realization of ultra-wide resonance detection regime of spin-torque diode radio-frequency detector by utilizing tilted fixed-layer magnetization

A novel spin-torque diode radio-frequency detector structure based on tilted fixed-layer magnetic tunnel junction (MTJ) is proposed in this study. The MTJ sandwich structure is composed of NiFe free layer, FePt fixed layer, and MgO interlayer. In order to sense RF signals of different frequencies, both the spin-transfer-torque effect and the alternating-voltage-controlled magnetic anisotropy effect are integrated into the simulation. Results demonstrate that tilting the fixed-layer magnetization can drastically increase the resonance detection regime.postprin