Papers by Keyword: Anisotropic Magnetoresistance

Abstract: Magnetoresistive effect and electrotransport properties of Ni_х(MgO)_100-х (x: 21-48 at.%) granular composites have been investigated. It is found that prepercolated composites (x < 24 at.%) do not exhibit magnetoresistive properties. After percolation threshold (x: 27-29 at.%) the composites exhibit isotropic negative magnetoresistance (-0,2 %) which has not tunneling nature. Also weak localization is realized in these samples at temperatures below 100 K. At high metal concentration (32 at.% < x) the composites exhibit anisotropic magnetoresistance.

Abstract: The evolution in microelectronics and microarchitecture lead to the creation of cheap and reliable embedded magnetic sensors. Anisotropic Magnetoresistors (AMR), being able to measure one axis magnetic fields, have been employed in many applications so far. In this paper AMR sensor (HMC2003) manufactured by Honeywell Inc. was tested for its ability to detect the magnetic field of a vehicle. Two different sensor topologies were examined regarding their performance in vehicle detection and monitoring.

Abstract: Magnetic sensors have been for many decades the industry standard for a variety of applications due to many unique advantages they possess compared to other sensor types. Recently, different types of magnetic sensors have been employed for vehicle detection and monitoring purposes. In this paper the performance of an anisotropic magnetoresistance (AMR) sensor for detecting the presence of small boats within small scale harbors has been evaluated, in order to assess the applicability of the specific sensor for port monitoring purposes.

Abstract: We derive the general expression of the anisotropic magnetoresistance (AMR) ratio of ferromagnets for a relative angle between the magnetization direction and the current direction. We here use the two-current model for a system consisting of a spin-polarized conduction state (s) and localized d states (d) with spin-orbit interaction. Using the expression, we analyze the AMR ratios of Ni and a half-metallic ferromagnet. These results correspond well to the respective experimental results. In addition, we give an intuitive explanation about a relation between the sign of the AMR ratio and the s-d scattering process.