What is meant by Magnetostruction effect?
What is meant by Magnetostruction effect?
Magnetostriction is a property of ferromagnetic materials that causes them to change their shape when subjected to a magnetic field. The effect was first identified in 1842 by James Joule when observing a sample of nickel. This effect can cause losses due to frictional heating in susceptible ferromagnetic cores.
How is magnetoelectric effect measured?
The traditional method for measuring magnetoelectric effect is to stimulate the sample with a magnetic field while measuring the voltage generated across the sample. These voltages can be so small that a lock-in amplifier is required to pull the signal out of ambient noise.
What are magnetoelectric materials?
22nd Nov, 2014. Ajeet Kumar. Yeungnam University. In general we discuss about three ferroic phase such as ferromagnetic (magnetic field and B-H loop), ferroelectric (electric field and P-E loop) ferroelastic (stress and S-E loop) phases. Multifferroic materials shows more than one ferroic phase (combinations).
What is ME coupling?
In its most general form, the magnetoelectric effect (ME) denotes any coupling between the magnetic and the electric properties of a material. Multiferroics are another example of single-phase materials that can exhibit a general magnetoelectric effect if their magnetic and electric orders are coupled.
What is an application of a magnetostriction device?
Applications. Magnetostrictive materials are used to convert electromagnetic energy into mechanical energy and vice versa. This effect can be used to create sensors that measure a magnetic field or detect a force. The magnetic field or force applied would create a strain in the material, which can be measured.
How do you find the magnetoelectric coefficient?
magnetoelectric effect in a given composite is usually characterized by measuring the magnetoelectric coefficient, α = dE/dH where E is electric field and H is the magnetic field. magnetoelectric effect using the dynamic method and also a new method developed in our laboratory which is based on pulsed magnetic fields.
What are some promising applications of magnetoelectric effect?
Some promising applications of the ME effect are sensitive detection of magnetic fields, advanced logic devices and tunable microwave filters. The first example of a magnetoelectric effect was discussed in 1888 by Wilhelm Röntgen, who showed that a dielectric material moving through an electric field would become magnetized.
What is the first material where intrinsic linear magnetoelectric effect was predicted?
The first material where an intrinsic linear magnetoelectric effect was predicted theoretically and confirmed experimentally is Cr 2O 3. This is a single-phase material. Multiferroics are another example of single-phase materials that can exhibit a general magnetoelectric effect if their magnetic and electric orders are coupled.
What happens when a magnetic field is applied to magnetoelastic material?
For this system, application of a magnetic field will induce a change in the dimension of the magnetoelastic film. This process, called magnetostriction, will alter residual strain conditions in the magnetoelastic film, which can be transferred through the interface to the piezoelectric substrate.
How does a magnetoelectric effect arise microscopically?
There are several ways in which a magnetoelectric effect can arise microscopically in a material. In crystals, spin-orbit coupling is responsible for single-ion magnetocrystalline anisotropy which determines preferential axes for the orientation of the spins (such as easy axes).
