Figure 1: Effect of annealing on tunneling magnetoresistance ratio. Low-noise magnetic sensors (noise spectral density ~ pT/Hz1⁄2) based on magnetic tunnel junctions can be integrated to provide unprecedented clinical information, viz., room-temperature magnetocardiography [1]. The sensors comprise a tunnel junction, a “flux concentrator,” and a mechanism for chopping the input signal with a mi...

We measured the low frequency (10mHz < f < 10Hz) resistance fluctuations (Noise) in single crystalline ferromagnetic Ni nanowires (diameter ∼ 35nm) in the temperature range 80K-300K. The noise spectral power shows 1/f dependence. The nanowires in an applied magnetic field show negative magetoresistance that saturates for H ≤ HC . The noise spectral power shows a reduction in low applied field a...

This work deals with the analysis of noise sources of the off-diagonal magneto-impedance sensor with stressannealed amorphous ribbon. This experimental analysis shows that the equivalent magnetic noise spectral density is mostly due to the electronic conditioning circuitry that operates the sensor. The electronic noise was then reduced with employment of an improved excitation-detection techniq...

Statistical treatment of the succession in time of the Barkhausen-noise pulses shows that magnetic noise possesses characteristics that are similar to those of electric shot noise. On the other hand, the electric shotnoise intensity in a noisy component is known to be related directly to the square root of the dc current through the component. Hence, it is intriguing to relate in the same manne...

Magnetic nanoparticles have proven to be extremely useful in a broad range of biomedical applications. To ensure optimal efficiency, precise characterization these particles is required. Thermal Noise Magnetrometry (TNM) recently developed technique that has already been validated against other techniques. TNM offers unique advantage no external excitation the system required drive measurement....

Even in magnetic shield, external magnetic field could not be neglected especially for magneto-meter system, and, it will be considered as uniform external noise. Also, the noise is caused by nearer external source, and is not uniform one of the noise. In this paper, the influence of the external uniform field and the external gradient noise on inverse problem solution by the SMN (Selective Min...