Related Experiment Video
Updated: Mar 15, 2026
09:06
Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
8.7K
Dynamic Feedback in Ferromagnet-Spin Hall Metal Heterostructures.
Ran Cheng1, Jian-Gang Zhu2, Di Xiao1
1Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
Physical Review Letters
|September 10, 2016
Summary
Spin pumping and spin-transfer torques in heterostructures create feedback, enabling nonlinear damping for stable spin Hall oscillator operation and frequency-dependent spin Hall magnetoimpedance.
Area of Science:
- Condensed matter physics
- Spintronics
- Materials science
Background:
- Ferromagnet-normal-metal heterostructures exhibit reciprocal spin pumping and spin-transfer torques.
- These processes create a dynamic feedback loop between magnetization and current dissipation.
Purpose of the Study:
- Investigate the dynamic feedback effect in ferromagnet-normal-metal heterostructures.
- Analyze its impact on magnetization dynamics and electrical properties.
Main Methods:
- Solving the spin diffusion equation considering the spin Hall effect in the normal metal.
- Theoretical analysis of the interplay between spin dynamics and charge transport.
Main Results:
- Identified nonlinear magnetic damping essential for sustained large-angle oscillations in spin Hall oscillators.
- Derived frequency-dependent spin Hall magnetoimpedance, reducing to spin Hall magnetoresistance at DC.
Conclusions:
- The dynamic feedback mechanism is crucial for understanding spin Hall oscillator behavior.
- Spin Hall magnetoimpedance offers insights into high-frequency spintronic device characteristics.
Related Concept Videos
01:31Ferromagnetism
3.4K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
3.4K
01:27Biasing of Metal-Semiconductor Junctions
761
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
761
01:30The Hall Effect
4.9K
Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
4.9K
02:42Valence Bond Theory
11.5K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.5K
01:17Magnetic Damping
1.2K
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
1.2K
03:02Colors and Magnetism
14.4K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
14.4K