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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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...
Magnetic Fields01:27

Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
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Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
Magnetism01:30

Magnetism

Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
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Magnetic Field Due To A Thin Straight Wire01:27

Magnetic Field Due To A Thin Straight Wire

Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.

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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Easy-axis ferromagnetic chain on a metallic surface.

Alejandro M Lobos1, Miguel A Cazalilla

  • 1Condensed Matter Theory Center and Joint Quantum Institute, Department of Physics, University of Maryland, College Park, MD 20742-4111, USA. alobos@umd.edu

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 27, 2013
PubMed
Summary
This summary is machine-generated.

This study explores magnetic impurity spin chains on metallic surfaces, revealing a quantum phase transition from ferromagnetic order to a disordered paramagnetic state due to Kondo coupling. This transition impacts magnetic excitations and has experimental implications.

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Area of Science:

  • Condensed Matter Physics
  • Surface Science
  • Quantum Magnetism

Background:

  • Investigating magnetic impurities on surfaces is crucial for understanding novel quantum phenomena.
  • The Kondo effect describes the interaction between magnetic impurities and conduction electrons in metals.
  • Spin chains offer a platform to study collective magnetic behaviors and quantum phase transitions.

Purpose of the Study:

  • To investigate the magnetic phases and excitation spectrum of an easy-axis ferromagnetic spin chain (S=1/2) on a metallic surface.
  • To understand the influence of Kondo coupling on the system's magnetic order and quantum phase transitions.
  • To explore the nature of excitations in different magnetic phases and their experimental observability.

Main Methods:

  • Theoretical study of an easy-axis ferromagnetic chain of S=1/2 magnetic impurities.
  • Analysis of the system's behavior as a function of Kondo coupling to a metallic surface at low temperatures.
  • Investigation of quantum phase transitions and excitation spectra.

Main Results:

  • A quantum phase transition occurs from an Ising ferromagnetic phase to a paramagnetic phase as Kondo coupling increases.
  • In the paramagnetic phase, impurities form Kondo singlets, completely screened by the metallic host.
  • In the ferromagnetic phase, excitations are damped magnons with finite lifetimes due to substrate coupling.

Conclusions:

  • The study elucidates the critical role of Kondo coupling in driving quantum phase transitions in surface-bound spin chains.
  • Excitations in the ferromagnetic phase exhibit damping, providing insights for experimental spectroscopy.
  • The findings pave the way for studying more complex spin chains (S>1/2) and their potential applications.