Related Experiment Video
Updated: Jan 30, 2026
06:34
Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
Published on: September 19, 2020
6.3K
Size-Dependent and Multi-Field Coupling Behavior of Layered Multiferroic Nanocomposites
Yang Shi1,2, Yongkun Wang3
1School of Mechano-Electronic Engineering, Xidian University, Xi'an, Shanxi 710071, China. shiyang@xidian.edu.cn.
Materials (Basel, Switzerland)
|January 17, 2019
Summary
This study introduces a new model for magnetoelectric (ME) coupling in multiferroic nanocomposites. The research highlights how size, surface effects, and external fields significantly enhance ME performance in nano-devices.
Area of Science:
- Materials Science
- Nanotechnology
- Condensed Matter Physics
Background:
- Magnetoelectric (ME) coupling in multiferroic composites is crucial for developing advanced nano-devices.
- Understanding ME effects at the nanoscale requires sophisticated modeling that accounts for various physical phenomena.
Purpose of the Study:
- To propose a novel nonlinear multi-field coupling model for ME effects in layered multiferroic nanocomposites.
- To investigate the influence of external fields on strain gradient and flexoelectricity for the first time.
- To comprehensively analyze size-dependent parameters and multi-field conditions on ME performance.
Main Methods:
- Development of a nonlinear multi-field coupling model incorporating surface stress, strain gradient theory, and nonlinear magneto-elastic-thermal coupling.
- Numerical investigation of ME coupling in layered multiferroic nanocomposites.
Main Results:
- ME coupling is highly size-dependent at the nanoscale, with reduced thickness significantly impacting performance.
- Surface effects and flexoelectricity were found to enhance the ME coefficient.
- Strain gradients at the nanoscale are significant and influenced by external stimuli.
- Nonlinear coupling in ferromagnetic materials allows for optimization of ME coefficient with compressive stress and temperature.
Conclusions:
- The proposed model provides a theoretical foundation for analyzing and evaluating nanostructure-based ME devices.
- External stimuli and size-dependent parameters play a critical role in optimizing ME performance.
- The study demonstrates potential for enhancing ME devices through careful material design and control of operating conditions.
Related Concept Videos
01:22Cell Size
127.2K
Cell sizes vary widely among and within organisms. Bacterial cells range between 1-10 micrometers (μm)and are considerably smaller than most eukaryotic cells. The smallest bacteria are 0.1 μm in diameter—about a thousand times smaller than eukaryotic cells, which typically range from 10-100 μm.
Surface Area
Cells can take in nutrients and water via diffusion through the plasma membrane itself or through specific channels in the membrane. The area of the membrane surrounding...
Surface Area
Cells can take in nutrients and water via diffusion through the plasma membrane itself or through specific channels in the membrane. The area of the membrane surrounding...
127.2K
01:20Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
1.7K
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...
1.7K
01:22Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)
1.5K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
1.5K
00:54What is Behavior?
10.3K
Behaviors are actions that an organism engages in—they can be related to finding food, reproducing, defending against threats, and many other possible actions. Behaviors include activities related to the environment around the animal—such as migration—as well as social interactions within a species or population. Many behaviors involve motor output—that is, muscle movements—while others involve less visible actions, such as learning.
10.3K
01:21Frequency-dependent Selection
23.9K
When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
23.9K
01:21G-protein Coupled Receptors
132.0K
G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.
132.0K