Related Experiment Video
Updated: May 31, 2025
09:06
Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
8.0K
Intrinsic Solution to the Dilemma between High-Efficiency and External-Field-Free Spin-Orbit Torque Switching Based
Biao Wu1, Siyuan Jiang1, Di Wang1
1School of Microelectronics, University of Science and Technology of China, Hefei 230026, People's Republic of China.
Nano Letters
|January 22, 2025
Summary
Spin-orbit torque (SOT) offers fast writing for magnetic random-access memories (MRAMs). Utilizing biaxial systems intrinsically solves the challenge of achieving high switching efficiency without external fields in SOT-MRAM devices.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Spintronics
Background:
- Spin-orbit torque (SOT) is a promising technology for magnetic random-access memories (MRAMs) due to its speed and robustness.
- A key challenge in SOT devices is the incompatibility between achieving field-free switching and high switching efficiency.
Purpose of the Study:
- To propose and demonstrate a novel approach to intrinsically overcome the limitations in SOT devices.
- To enable high-efficiency and external-field-free switching in SOT-MRAMs.
Main Methods:
- Theoretical proposal of utilizing biaxial systems to address SOT switching challenges.
- Experimental demonstration of the proposed scheme in a MgO/Fe/W device.
Main Results:
- Biaxial systems intrinsically solve the dilemma between high switching efficiency and external-field-free operation in SOT.
- The intrinsic multistate storage capability of the biaxial device was shown to compensate for increased area requirements.
Conclusions:
- The proposed biaxial system approach offers a viable solution for advanced SOT-MRAM development.
- This work paves the way for overcoming critical challenges in SOT-based memory technologies.
Related Concept Videos
01:13Torque On A Current Loop In A Magnetic Field
3.8K
The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
3.8K
01:08Spin–Spin Coupling Constant: Overview
864
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...
864
01:13Angle of Twist: Problem Solving
257
An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the...
257
01:03Atomic Nuclei: Nuclear Spin State Overview
855
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...
855
01:20Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
949
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
949
01:23Atomic Nuclei: Nuclear Relaxation Processes
608
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.
608