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Related Concept Videos

Magnetic Field Of A Current Loop

Magnetic Field Of A Current Loop

Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.

Magnetic Vector Potential

Magnetic Vector Potential

In electrostatics, the electric field can be written as the negative gradient of the potential. In magnetostatics, the zero divergence of the magnetic field ensures that the magnetic field can be expressed as the curl of a vector potential. This potential is known as the magnetic vector potential.
Consider an ideal solenoid with n turns per unit length and radius R. If I is the current through the solenoid, the magnetic field inside the solenoid is expressed as the product of vacuum...

Magnetic Field Due To A Thin Straight Wire

Magnetic Field Due To A Thin Straight Wire

Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.

Magnetic Field due to Moving Charges

Magnetic Field due to Moving Charges

A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...

Torque On A Current Loop In A Magnetic Field

Torque On A Current Loop In A Magnetic Field

The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...

Magnetic Field of a Solenoid

Magnetic Field of a Solenoid

A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field due to a solenoid is the vector sum of the magnetic fields due to its individual turns. Therefore, for an ideal solenoid, the magnetic field within the solenoid is directly proportional to the number of turns per unit length and the current. Conversely, the magnetic field outside the solenoid is zero.
Consider a solenoid with 100 turns wrapped around a cylinder of...

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Related Experiment Video

Updated: Aug 9, 2025

Scanning SQUID Study of Vortex Manipulation by Local Contact

Scanning SQUID Study of Vortex Manipulation by Local Contact

Published on: February 1, 2017

A Superconducting Micro-Magnetometer for Quantum Vortex in Superconducting Nanoflakes.

Xiangyu Bi¹, Feifan Tian¹, Ganyu Chen¹

¹National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, Nanjing University, Nanjing, 210000, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)

|February 22, 2023

Summary

A new superconducting nano-hole array enables contactless magnetic property detection in micro-sized superconducting nanoflakes. This method quantifies vortex pinning centers, overcoming limitations of conventional superconducting quantum interference device (SQUID) techniques for small samples.

Keywords:

Bi 2Sr 2CaCu 2O 8 Little-Parks oscillation superconducting quantum interferometer devices superconductivity vortex pinning

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Related Experiment Videos

Last Updated: Aug 9, 2025

Scanning SQUID Study of Vortex Manipulation by Local Contact

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Published on: February 1, 2017

Fabrication of Magnetic Nanostructures on Silicon Nitride Membranes for Magnetic Vortex Studies Using Transmission Microscopy Techniques

Fabrication of Magnetic Nanostructures on Silicon Nitride Membranes for Magnetic Vortex Studies Using Transmission Microscopy Techniques

Published on: July 2, 2018

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

Area of Science:

Condensed matter physics
Quantum materials science
Nanotechnology

Background:

Superconducting quantum interferometer devices (SQUIDs) are crucial for studying quantum materials but are limited to bulky samples.
Probing magnetic properties of micro-scale samples with weak magnetic signals is challenging with conventional methods.

Purpose of the Study:

To develop a contactless method for detecting magnetic properties of micro-sized superconducting nanoflakes.
To investigate quantized vortices and their pinning centers in these small-scale samples.

Main Methods:

Utilizing a specially designed superconducting nano-hole array for detection.
Measuring magnetoresistance signals from micro-sized superconducting nanoflakes.

Main Results:

Successfully realized contactless detection of magnetic properties and quantized vortices in micro-superconducting nanoflakes.
Observed anomalous hysteresis loops and suppressed Little-Parks oscillations due to disordered pinned vortices.
Quantitatively evaluated the density of pinning centers in Bi₂ Sr₂ CaCu₂ O_8+δ nanoflakes.

Conclusions:

The superconducting micro-magnetometer offers a novel approach for mesoscopic electromagnetic phenomena research.
This technique overcomes the limitations of conventional SQUID for analyzing micro-scale superconducting samples.
Enables quantitative evaluation of vortex pinning centers, previously inaccessible.