Spin Polarized Current: Magnetic Moment & Interaction

In summary, the magnetic moment of normal current is not affected by the spin of electrons as it is a result of their movement, and a wire of current with all polarized electrons will attract a wire with all polarized down electrons. Additionally, superconductors have no magnetic field inside of them because the movement of electrically charged particles does not create a magnetic field.
  • #1
lufc88
52
0
How come normal current has a magnetic moment if 50% of electrons have spin up and 50% have spin down. Is it because they have to be in pairs?
Would a wire of current with electrons all polarized up attract a wire next to it with electrons all polarized down?

Extra question
How come superconductors have no B field by the way?
 
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  • #2
The magnetic field caused by a current isn't a consequence of electron spin. Any electrically charged particle that is moving will produce a magnetic field.
 
  • #3
Sorry ignore the first question so again why does a superconductor have no magnetic field inside of it if electrically charged particles are moving.
 

1. What is spin polarized current?

Spin polarized current refers to a flow of electrons in a material where the majority of the electrons have the same spin direction. This spin alignment can be controlled and manipulated through the use of external magnetic fields, making it a valuable tool in spintronics and magnetic storage devices.

2. How is magnetic moment related to spin polarized current?

Magnetic moment is a property of particles, such as electrons, that describes their ability to interact with magnetic fields. In spin polarized current, the magnetic moments of the electrons are aligned in the same direction, which allows for more efficient interaction with magnetic fields and easier control of the current.

3. What is the significance of spin polarized current in spintronics?

Spintronics is a field of research that focuses on utilizing the spin of electrons in addition to their charge for various applications. Spin polarized current plays a crucial role in spintronics as it allows for the manipulation and control of electron spins, enabling the development of new technologies such as spin-based transistors and magnetic memory devices.

4. How does spin polarized current interact with magnetic fields?

In spin polarized current, the majority of electrons have their spins aligned in the same direction. When an external magnetic field is applied, these electrons will experience a force that is dependent on their spin orientation. This allows for the manipulation and control of the current through the use of magnetic fields.

5. What are the potential applications of spin polarized current?

Spin polarized current has a wide range of potential applications in fields such as spintronics, magnetic storage, and quantum computing. It could be used to create more efficient electronic devices, as well as to develop new technologies for data storage and transmission. Additionally, spin polarized current could also have implications in the field of quantum information processing, where spin-based qubits could be used for faster and more secure data processing.

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