Carrier-resolved multiple dipole line magnet photo-hall system
US10197640B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 30, 2016 |
| Grant date | Feb 5, 2019 |
| Priority date | — |
| Expiry date | Sep 30, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/07
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention provides a high-sensitivity, carrier-resolved photo-Hall and photoelectromagnet (PEM) system utilizing multiple parallel dipole line (PDL) magnet systems. In one aspect of the invention, a Hall measurement apparatus is provided. The Hall measurement apparatus includes: a measurement chamber (e.g., a cryostat); a Hall module having at least one freely-rotating cylindrical magnet within the measurement chamber; a motor-driven cylindrical magnet adjacent to the at least one freely-rotating cylindrical magnet; an optical module for photo-Hall measurement, a set of electronics instruments and a data and signal analysis program for n-th harmonics lock-in detection of magnetoresistance signal and a control program. The system yields majority carrier type, density and mobility and, with illumination, minority carrier mobility and density.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.