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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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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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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
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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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Updated: Aug 23, 2025

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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Atomic Force Manipulation of Single Magnetic Nanoparticles for Spin-Based Electronics.

Paul Burger1,2, Gyanendra Singh1,3, Christer Johansson1,4

  • 1Department of Microtechnology and Nanoscience - MC2, Chalmers University of Technology, GothenburgSE-41296, Sweden.

ACS Nano
|October 31, 2022
PubMed
Summary

Researchers precisely manipulated magnetic nanoparticles (MNPs) using an atomic force microscope tip. This technique enabled the creation of novel nanomagnetic structures for advanced spin-based nanoelectronics.

Keywords:
Hall magnetometryLAO−STO interfaceatomic force microscopymagnetic nanoparticlesnanomanipulationoxide heterointerfaces

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Condensed Matter Physics

Background:

  • Top-down lithographic patterning is limited for fabricating certain nanomagnetic structures.
  • Magnetic nanoparticles (MNPs) offer a versatile alternative for creating tailored nanomagnetic architectures.
  • Atomic force microscopy (AFM) provides high-resolution manipulation capabilities.

Purpose of the Study:

  • To demonstrate precise, controllable manipulation of individual magnetic nanoparticles.
  • To investigate the magnetic coupling between single MNPs and a two-dimensional electron gas (2DEG).
  • To explore the potential for creating novel magnetic proximity devices.

Main Methods:

  • Utilized an atomic force microscope (AFM) tip for manipulating individual magnetite MNPs (50 nm diameter).
  • Placed MNPs onto a Hall bar fabricated in a quasi-two-dimensional electron gas (q2DEG) at the LaAlO3/SrTiO3 (LAO/STO) interface.
  • Measured Hall resistance hysteresis loops to probe magnetic properties.

Main Results:

  • Successfully demonstrated controlled placement of individual MNPs on a Hall bar.
  • Observed magnetic hysteresis in the Hall resistance, attributed to the MNP's magnetic properties.
  • Showed that effective coercivity could be tuned by altering the field-cooling angle, linked to MNP magnetic moment alignment across the Verwey transition.

Conclusions:

  • Precise MNP manipulation using AFM is feasible for fabricating custom nanomagnetic structures.
  • The study highlights the potential for magnetic proximity effects between single MNPs and 2DEGs.
  • Results pave the way for experimental realization of single-MNP based magnetic proximity devices for spin-based nanoelectronics.