Related Experiment Video
Updated: Apr 23, 2026
09:06
Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
6.6K
Spintronic functionality of BiFeO3 domain walls
Ji Hye Lee1, Ignasi Fina, Xavi Marti
1Max Planck Institute of Microstructure Physics, Weinberg 2, Halle (Saale), D-06120, Germany.
Advanced Materials (Deerfield Beach, Fla.)
|September 25, 2014
Summary
Anisotropic magnetoresistance was observed at BiFeO3 domain walls using micro-devices. This finding suggests domain walls in ferroelectric materials can function as tunable nanospintronic objects.
Area of Science:
- Condensed matter physics
- Materials science
- Nanotechnology
Background:
- Anisotropic magnetoresistance (AMR) is crucial in spintronic technology, typically observed in ferromagnetic metals.
- Domain walls in ferroelectric materials like BiFeO3 are regions of structural and property transitions.
Purpose of the Study:
- To investigate the presence and characteristics of anisotropic magnetoresistance at the domain walls of BiFeO3.
- To explore the potential of ferroelectric domain walls as components in nanospintronic devices.
Main Methods:
- Fabrication of specialized micro-devices for precise domain wall manipulation and characterization.
- Direct magneto-transport measurements to probe the electrical and magnetic properties of domain walls.
Main Results:
- Direct observation of anisotropic magnetoresistance (AMR) at the conductive domain walls of BiFeO3.
- Demonstration that domain walls in this insulating ferroelectric exhibit AMR, similar to ferromagnetic metals.
Conclusions:
- Ferroelectric domain walls in BiFeO3 can exhibit anisotropic magnetoresistance.
- These domain walls represent a novel class of electrically tunable nanospintronic objects, opening new avenues in materials science and spintronics.
Related Concept Videos
02:42Valence Bond Theory
8.8K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.8K
01:31Ferromagnetism
2.8K
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...
2.8K
01:17Spin–Spin Coupling: One-Bond Coupling
1.2K
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
1.2K
01:03Atomic Nuclei: Nuclear Spin State Overview
1.9K
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 one, the...
1.9K
01:27Electrostatic Boundary Conditions in Dielectrics
2.1K
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity....
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity....
2.1K
01:22Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)
1.3K
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...
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...
1.3K