Related Experiment Video
Updated: May 12, 2025
07:42
Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
Published on: July 20, 2022
2.6K
Asymmetric Magnetization Switching and All-Electric Field-Free Programmable Spin Logic Enabled by the Interlayer
Guocai Wang1, Lei Guo1, Hua Su1
1State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China.
ACS Applied Materials & Interfaces
|April 28, 2025
Summary
Interlayer Dzyaloshinskii-Moriya interaction (DMI) enables field-free magnetization switching in CoFeB/Pt/CoFe/Pt systems. This breakthrough facilitates the development of energy-efficient, all-electric logic gates and memory devices.
Area of Science:
- Spintronics
- Materials Science
- Condensed Matter Physics
Background:
- Interfacial Dzyaloshinskii-Moriya interaction (DMI) is key for creating non-trivial spin textures in 2D spintronic devices.
- Interlayer DMI in multilayer films offers new possibilities for chiral effects in 3D spin structures.
- This DMI is crucial for advancing fast and energy-efficient spintronic applications.
Purpose of the Study:
- To investigate asymmetric current-driven field-free magnetization switching in an orthogonal CoFeB/Pt/CoFe/Pt system.
- To explore the role of interlayer DMI in achieving efficient field-free switching.
- To demonstrate the application of this phenomenon in all-electric programmable logic gates.
Main Methods:
- Fabrication and characterization of CoFeB/Pt/CoFe/Pt multilayer structures.
- Experimental observation and analysis of current-driven magnetization switching.
- Tilt angle measurements to verify the underlying physical mechanisms.
Main Results:
- Observation of unique asymmetric field-free magnetization switching.
- Achieved a high field-free switching ratio of nearly 90%.
- Confirmed that interlayer DMI and canted magnetization are responsible for the field-free switching.
Conclusions:
- The CoFeB/Pt/CoFe/Pt system exhibits efficient field-free switching due to interlayer DMI.
- This phenomenon enables the implementation of three all-electric programmable logic gates.
- The research lays the groundwork for low-power, high-speed, all-electric logic and memory devices.
Related Concept Videos
01:03Atomic Nuclei: Nuclear Spin State Overview
812
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...
812
01:26Diamagnetism
2.4K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
2.4K
01:23Atomic Nuclei: Nuclear Relaxation Processes
581
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.
581
01:31Ferromagnetism
2.3K
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...
2.3K
01:05Atomic Nuclei: Magnetic Resonance
589
The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
589
01:24Potential Due to a Magnetized Object
248
Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
The vector...
248