Anna University, India

PhD (Physics-Materials Science), Indira Gandhi Centre for Atomic Research (Awarded by Anna University, Chennai, India)

PhD (Physics-Materials Science), Indira Gandhi Centre for Atomic Research (Awarded by Anna University, Chennai, India)

2011

ปริญญาเอก

attocube systems AG

Researcher

2565

Eglfinger Weg 2, 85540 Haar, Germany

2565

High-temperature superconducting nanocomposite devices based on Josephson effect and vortex pinning for extremely low-level signal measurement and non-invasive medical diagnostics

The detection of very low magnetic field signal can be applied to real-life situation; for example, the measurement of magnetic field due to the flow of charge in nerve in order to observe the relationship between the movement of the body parts and the function of the nervous system in the brain. In this project, the magnetic field quantum sensor based on the Josephson effect of the Josephson junction will be investigated. The Josephson effect involves the quantum tunneling effect of Cooper pairs that travel from the superconducting layer, passing through a thin insulating layer, to another superconducting layer. This small tunneling current (in the order of micro- to milli-ampere range) can flow without any voltage. If the current flowing through this junction is greater than the critical current (IC ), the voltage will be induced. It is known that this superconducting critical current is highly sensitive to the external signals, e.g. electromagnetic waves at various frequencies or magnetic field. The type of response to the electromagnetic waves (step height and interval) by the critical current and induced voltage could be used as the calibration for the voltage standard or used for the detection of very low voltage signal (in the order of 10-12 V) in a material. For the response of the critical current to the external magnetic field can be applied for the measurement of very low magnetic field signal (e.g. 10-14 tesla). The ability for this low-level signal measurements may also be applied to the detection of the background noise temperature. By the design of suitable electronic circuit and written control program in order to separate the required signals (e.g. those emitted from the body of a patient) and the background noise signal, it is possible to determine the health status or the disease location.