Related Experiment Video
Updated: Jan 24, 2026
07:50
Measuring Local Tissue Strains in Tendons via Open-Source Digital Image Correlation
Published on: January 27, 2023
3.6K
Shear-strain-mediated magnetoelectric effects revealed by imaging
M Ghidini1,2,3, R Mansell4, F Maccherozzi5
1Department of Mathematics, Physics and Computer Science, University of Parma, Parma, Italy. massimo.ghidini@unipr.it.
Nature Materials
|May 22, 2019
Summary
Shear strains from ferroelectric domain switching were found to influence magnetoelectric effects in nickel films. This discovery impacts the design of future magnetoelectric devices.
Area of Science:
- Condensed matter physics
- Materials science
- Nanotechnology
Background:
- Ferroelectric domain switching can alter ferromagnetic film magnetization via magnetoelectric effects.
- Previous studies focused on specific strain components, neglecting shear strains.
Purpose of the Study:
- To investigate the role of shear strains in magnetoelectric coupling.
- To analyze magnetization changes in nickel films on ferroelectric substrates.
Main Methods:
- Utilized X-ray magnetic circular dichroism (XMCD) with photoemission electron microscopy (PEEM) for high-resolution magnetization mapping.
- Employed vibrating sample magnetometry (VSM) to measure bulk magnetoelectric effects.
- Fabricated a polycrystalline nickel film on a 0.68Pb(Mg1/3Nb2/3)O3-0.32PbTiO3 substrate in the pseudo-cubic (011)pc orientation.
Main Results:
- Confirmed the presence of shear strains accompanying ferroelectric domain switching.
- Observed local magnetization rotations deviating from the expected 90°, ranging from 62° to 84°.
- Discrepancy between VSM-indicated giant effects and PEEM-observed smaller local rotations.
Conclusions:
- Shear strain is a critical, previously overlooked factor in magnetoelectric coupling.
- The non-orthogonal magnetization rotation presents challenges and opportunities for miniaturizing magnetoelectric devices.
More Related Videos
07:37Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
Published on: January 16, 2019
10.1K
06:51Light-sheet Fluorescence Microscopy to Capture 4-Dimensional Images of the Effects of Modulating Shear Stress on the Developing Zebrafish Heart
Published on: August 10, 2018
8.8K
Related Concept Videos
01:20Shearing Strain
1.3K
The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
1.3K
01:20Elastic Strain Energy for Shearing Stresses
490
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
490
01:19Shearing Stress
1.9K
Shearing stress, denoted by the Greek letter tau (τ), is stress caused by forces acting transversely on an object. These forces create internal ones within the entity in the plane where the external forces are applied. The resultant of these internal forces is the shear in the section.
The average shearing stress can be calculated by dividing the shear by the area of the cross-section.
The average shearing stress can be calculated by dividing the shear by the area of the cross-section.
1.9K
01:27Shear Diagram
1.6K
In the study of beam mechanics, shear diagrams play a crucial role in understanding the distribution of shear forces along the length of a beam. Consider a beam AB that is supported at both ends and subjected to perpendicular loads.
First, a free-body diagram of the beam is drawn, representing all the external forces and internal reactions acting on the beam. One can calculate the reaction forces at each support by employing the equilibrium equations of force and moment. The vertical component...
First, a free-body diagram of the beam is drawn, representing all the external forces and internal reactions acting on the beam. One can calculate the reaction forces at each support by employing the equilibrium equations of force and moment. The vertical component...
1.6K
01:19Thermal Strain
2.8K
Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
2.8K
01:27Measurements of Strain
2.6K
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
2.6K