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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

7.4K
A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
7.4K
Magnetic Field of a Solenoid01:18

Magnetic Field of a Solenoid

5.9K
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...
5.9K
Magnetic Field Lines01:19

Magnetic Field Lines

5.8K
The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:
5.8K
Energy In A Magnetic Field01:24

Energy In A Magnetic Field

2.8K
If a magnetic field is sustained, there must be a current in a closed circuit or loop, implying some energy has been spent in creating the field. If this energy is not dissipated via the circuit's resistance, it is stored in the field.
Take an ideal inductor with zero resistance. Although it's practically impossible, assume that the coil's resistance is so small that it is practically negligible. The loss of the field's energy to dissipate thermal energy (or heat) is thus...
2.8K
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

6.4K
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.
6.4K
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

11.7K
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...
11.7K

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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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Nanoscale Spin Manipulation with Pulsed Magnetic Gradient Fields from a Hard Disc Drive Writer.

S Bodenstedt1, I Jakobi1, J Michl1

  • 13. Physikalisches Institut, Universität Stuttgart and Institute for Integrated Quantum Science and Technology IQST , Pfaffenwaldring 57 , D-70569 Stuttgart , Germany.

Nano Letters
|August 1, 2018
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Summary

Hard disk drive (HDD) magnetic writers can precisely control individual electron spins using strong, fast magnetic fields. This breakthrough enables advanced quantum technologies and nanoscale spin manipulation.

Keywords:
Nitrogen-vacancy (NV) centerhard disk drive writerindividual spin controlmagnetic gradient fieldsnonadiabatic fast passagepulsed magnetic fields

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Area of Science:

  • Quantum Information Science
  • Nanotechnology
  • Materials Science

Background:

  • Precise control of individual electron spins is vital for quantum computing, metrology, and imaging.
  • Generating strong, fast, and localized magnetic fields is essential for nanoscale spin manipulation.
  • Existing technologies often suffer from excessive magnetic noise at the nanoscale.

Purpose of the Study:

  • To demonstrate the utility of hard disk drive (HDD) magnetic writers for manipulating single and multiple electron spins.
  • To leverage the unique properties of HDD writers for advanced spin control applications.
  • To overcome limitations of current nanoscale magnetic field generation.

Main Methods:

  • Utilizing HDD writers with tunable magnetic field gradients up to 100 μT/nm.
  • Employing gigahertz bandwidth for rapid switching of control fields (nanosecond timescales).
  • Applying techniques like non-adiabatic fast passages and optical readout in strong misaligned fields.

Main Results:

  • Demonstrated spectral addressing of individual spins on the nanoscale.
  • Achieved spin manipulation faster than characteristic spin dynamics and optical transition times.
  • Successfully performed microwave selective addressing of single spins.
  • Enabled nanoscale optical colocalization of two emitters.

Conclusions:

  • HDD magnetic writers are effective tools for precise single and multiple spin manipulation.
  • The technology facilitates advanced spin control beyond current capabilities.
  • This approach opens new avenues for quantum information processing, metrology, and nanoscale research.