Related Experiment Video
Updated: Jul 15, 2025
07:42
Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
Published on: July 20, 2022
2.8K
Strain-controlled spin transport in a two-dimensional (2D) nanomagnet.
1Department of Physics, Indian Institute of Technology Patna, Bihta, 801103, India.
Scientific Reports
|October 3, 2023
Summary
This study demonstrates strain-induced phase transitions in 2D chromium oxybromide (CrOBr), enabling controllable spin transport. The material exhibits perfect spin filtering, crucial for next-generation magneto-electronic devices.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Spintronics
Background:
- Integrating electronic and magnetic properties in semiconductors is key for advanced technologies.
- Two-dimensional (2D) magnets offer tunable electronic and magnetic phases at ambient temperatures.
Purpose of the Study:
- To investigate controlled spin transport in the 2D semiconductor CrOBr.
- To reveal the connection between magnetic order and charge carriers in CrOBr.
- To explore strain-induced electronic and magnetic phase transitions.
Main Methods:
- Systematic analysis of strain-induced electronic behavior using density functional theory (DFT) calculations.
- Investigation of spin-resolved conductance and current-voltage (I-V) characteristics.
Main Results:
- Demonstrated phase transitions from magnetic semiconductor to half-metal to magnetic metal under strain.
- Achieved 100% spin polarization and spin-injection efficiency.
- Observed high strain-assisted tunability in spin-polarized I-V trends, with notable peak-to-valley ratios and switching efficiency.
Conclusions:
- CrOBr exhibits perfect spin filtering and highly anisotropic behavior.
- Strain engineering in CrOBr offers significant implications for developing novel magneto-electronic devices.
Related Concept Videos
01:03Atomic Nuclei: Nuclear Spin State Overview
997
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
997
01:14Atomic Nuclei: Nuclear Spin State Population Distribution
1.0K
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
1.0K
01:08Spin–Spin Coupling Constant: Overview
957
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...
957
01:23Atomic Nuclei: Nuclear Relaxation Processes
676
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis.
676
00:59Atomic Nuclei: Nuclear Magnetic Moment
1.2K
All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
1.2K
01:08Atomic Nuclei: Nuclear Spin
2.0K
All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not...
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not...
2.0K