What is exchange interaction in ferromagnetic materials?

What is exchange interaction in ferromagnetic materials?

The phenomenon whereby individual atomic magnetic moments will attempt to align all other atomic magnetic moments within a material with itself is known as the exchange interaction (Aharoni, 2000).

What is magnetic exchange field?

The magnetic exchange field (MEF) induced by an adjacent magnetic insulator enables efficient control of local spin generation and spin modulation in 2D devices without compromising the delicate material structures.

What is exchange field?

In chemistry and physics, the exchange interaction (with an exchange energy and exchange term) is a quantum mechanical effect that only occurs between identical particles. Despite sometimes being called an exchange force in an analogy to classical force, it is not a true force as it lacks a force carrier.

What is a ferromagnetic field?

Ferromagnetism is a kind of magnetism that is associated with iron, cobalt, nickel, and some alloys or compounds containing one or more of these elements. It also occurs in gadolinium and a few other rare-earth elements.

What causes exchange energy?

The ultimate origin of the exchange energy for electrons is the Pauli exclusion principle, which states that two electrons cannot be in the same position at the same time.

What is exchange symmetry?

The exchange symmetry says that the swapping of two identical particles should leave their combined wave function unchanged—except for an overall phase. For fermions, this phase makes the combined wave function antisymmetric under the swapping, and as a result, the particles cannot occupy the same state.

What is domain theory of ferromagnetism?

The domain theory was proposed by Weiss in 1907. According to this theory, ferromagnetic material consists of a large number of tiny regions, and each region gets spontaneously magnetized to saturation. The domains are free to move among those tiny regions.

Why exchange forces are proposed?

Exchange forces were introduced by Werner Heisenberg (1932) and Ettore Majorana (1933) in order to account for the saturation of binding energy and of nuclear density.

What happens to a ferromagnetic material when it is placed in a magnetic field?

When a piece of ferromagnetic material is placed into an external magnetic field, two things happen. The spins in each domain shift so that the magnetic moments of the electrons become more aligned with the direction of the field.

Why is ferromagnetism used?

Ferromagnetic materials are commonly used for non-volatile information storage in tapes, hard drives, etc. They are also used for information-processing due to the interaction of electric current and light with magnetic order.

How does exchange energy work?

In chemistry and physics, the exchange interaction is a quantum mechanical effect that only occurs between identical particles. Exchange energy is the energy released when two or more electrons with the same spin-exchange their positions in the degenerate orbitals of a subshell.

Do humans exchange energy?

Energy exchange is fundamental to life and is a cornerstone in the study of human physiology, metabolism and nutrition.