Spin density induced by equilibrium spin current in a magnetic field

Area of Science:

• Condensed Matter Physics
• Spintronics
• Materials Science

Background:

• Spin current detection is crucial for spintronics applications.
• Existing methods for pure spin current detection are limited.
• Understanding spin current behavior is key to advancing spin-based technologies.

Purpose of the Study:

• To theoretically propose a novel method for detecting equilibrium spin current.
• To investigate the interaction between an external magnetic field and spin current in a narrow strip.
• To establish an experimentally measurable signature of pure spin current.

Main Methods:

• Theoretical modeling using Keldysh Green's function.
• Simulation of spin current generation by noncollinear ferromagnets.
• Analysis of the effect of an external magnetic field perpendicular to the strip plane.

Main Results:

• An external magnetic field induces antisymmetrical spin density at the lateral edges of the strip.
• The induced spin density is directly measurable experimentally.
• The magnitude and direction of spin density are controllable via ferromagnet magnetization.

Conclusions:

• The proposed scheme provides a new, direct approach for detecting pure spin currents.
• This method offers experimental control over spin density detection.
• The findings contribute to the development of advanced spintronic devices.