Related Experiment Video
Updated: Jan 5, 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
8.5K
Spin transport in insulators without exchange stiffness
Koichi Oyanagi1, Saburo Takahashi2,3,4, Ludo J Cornelissen5
1Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan. k.0yanagi444@gmail.com.
Nature Communications
|October 20, 2019
Summary
Gadolinium gallium garnet (GGG) acts as an efficient spin current conduit, challenging previous assumptions. This discovery opens new avenues for designing spintronic devices by demonstrating effective spin transport in non-magnetic materials.
Area of Science:
- Spintronics and material science
- Condensed matter physics
Background:
- Efficient spin current transmission is crucial for spintronics.
- Gadolinium gallium garnet (GGG) is an electric insulator and common substrate, not previously recognized for spin transport capabilities.
Purpose of the Study:
- To investigate spin current propagation in paramagnetic Gadolinium gallium garnet (GGG).
- To determine the spin transport properties of GGG and compare them to existing materials.
Main Methods:
- Experimental measurement of spin current propagation in GGG.
- Characterization of spin diffusion length and spin conductivity at low temperatures and high magnetic fields.
Main Results:
- Spin current propagation was observed in paramagnetic GGG over several microns.
- Spin transport persisted up to 100 K, well above the magnetic glass-like transition temperature.
- GGG exhibited a spin diffusion length of 1.8 ± 0.2 μm and spin conductivity of (7.3 ± 0.3) × 10⁴ Sm⁻¹ at 5 K and 3.5 T, surpassing that of YIG.
Conclusions:
- Efficient spin transport does not necessitate exchange stiffness, challenging conventional spintronics models.
- Paramagnetic GGG is a superior spin current conduit, offering new material design strategies for spintronic devices.
More Related Videos
Related Concept Videos
02:42Valence Bond Theory
11.0K
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...
11.0K
01:08Spin–Spin Coupling Constant: Overview
1.4K
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
1.4K
01:19Drift Velocity
5.3K
The high speed of electrical signals results from the fact that the force between charges acts rapidly at a distance. Thus, when a free charge is forced into a wire, the incoming charge pushes other charges ahead due to the repulsive force between like charges. These moving charges move the charges farther down the line. The density of charge in a system cannot easily be increased, so the signal is passed on rapidly. The resulting electrical shock wave moves through the system at nearly the...
5.3K
01:17Theory of Metallic Conduction
1.7K
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
1.7K
01:20Electric Field Inside a Conductor
7.2K
When a conductor is placed in an external electric field, the free charges in the conductor redistribute and very quickly reach electrostatic equilibrium. The resulting charge distribution and its electric field have many interesting properties, which can be investigated with the help of Gauss's law.
Suppose a piece of metal is placed near a positive charge. The free electrons in the metal are attracted to the external positive charge and migrate freely toward that region. This region then...
Suppose a piece of metal is placed near a positive charge. The free electrons in the metal are attracted to the external positive charge and migrate freely toward that region. This region then...
7.2K
01:21Carrier Transport
875
The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
875