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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

3.4K
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...
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Types Of Superconductors01:28

Types Of Superconductors

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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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Theory of Metallic Conduction01:17

Theory of Metallic Conduction

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The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
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¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.9K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

15.6K
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.6K
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...
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A high-temperature ferromagnetic topological insulating phase by proximity coupling.

Ferhat Katmis1,2,3, Valeria Lauter4, Flavio S Nogueira5,6

  • 1Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

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We demonstrate enhanced interface magnetism in topological insulators by coupling them with ferromagnetic materials. This creates robust magnetic order at room temperature, paving the way for advanced spintronic devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Topological insulators possess unique conducting surface states with spin-momentum locking, protected by time-reversal symmetry.
  • Integrating ferromagnetic order into topological insulators is crucial for next-generation electronic and spintronic devices.
  • Achieving robust, localized magnetic order without compromising quantum coherence is a key challenge.

Purpose of the Study:

  • To demonstrate topologically enhanced interface magnetism in a bilayer system.
  • To investigate the possibility of achieving room-temperature ferromagnetism in topological insulator heterostructures.
  • To explore the potential for energy-efficient topological control mechanisms in spintronic devices.

Main Methods:

  • Fabrication of a bilayer system coupling a ferromagnetic insulator (EuS) with a topological insulator (Bi2Se3).
  • Utilized spin-polarized neutron reflectivity experiments to probe interfacial magnetism.
  • Analyzed the magnetic ordering temperature and spatial extent of ferromagnetism.

Main Results:

  • Demonstrated topologically enhanced interface magnetism, persisting up to room temperature.
  • Observed that interfacial ferromagnetism extends approximately 2 nm into the topological insulator.
  • Confirmed that time-reversal symmetry is broken only near the surface, leaving bulk states unaffected.

Conclusions:

  • Coupling ferromagnetic insulators with topological insulators significantly enhances interfacial magnetism and raises the Curie temperature.
  • Engineered topological insulators exhibit a topological magneto-electric response, enabling electric-field control of magnetization dynamics.
  • This approach offers a pathway towards energy-efficient topological control for future spin-based technologies.