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Related Concept Videos

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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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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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All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
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Related Experiment Video

Updated: Apr 21, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Fluctuation-driven magnetic hard-axis ordering in metallic ferromagnets.

F Krüger1, C J Pedder2, A G Green2

  • 1London Centre for Nanotechnology, University College London, Gordon Street, London WC1H 0AH, United Kingdom and ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom.

Physical Review Letters
|October 18, 2014
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Summary
This summary is machine-generated.

Soft electronic fluctuations and magnetic anisotropies can cause ferromagnetic moments to align with a magnetic hard axis. This study explores this unusual magnetic ordering phenomenon in a two-band model.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Quantum magnetism

Background:

  • Ferromagnetic materials typically align moments along magnetic easy axes.
  • Understanding magnetic ordering is crucial for developing advanced electronic devices.

Purpose of the Study:

  • To investigate the interplay between electronic fluctuations and magnetic anisotropies.
  • To demonstrate how ferromagnetic moments can align along a magnetic hard axis.

Main Methods:

  • Utilized a generic two-band model with Coulomb and Hund's interactions.
  • Employed the fermionic quantum order-by-disorder approach for phase diagram calculation.
  • Analyzed self-consistent free-energy expansion around a magnetically ordered state.

Main Results:

  • Demonstrated that soft electronic particle-hole fluctuations can drive moments to the hard axis.
  • Revealed that quantum fluctuations cause a first-order transition below a tricritical point.
  • Identified directionally dependent transverse fluctuations as key to hard-axis ordering at low temperatures.

Conclusions:

  • The study provides a theoretical framework for unusual magnetic ordering along hard axes.
  • Findings offer insights into controlling magnetic properties in novel materials.
  • Results have implications for spintronics and magnetic data storage technologies.