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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...
Types Of Superconductors01:28

Types Of Superconductors

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...
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...
Diamagnetism01:26

Diamagnetism

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.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.
Paramagnetism01:30

Paramagnetism

Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...

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Related Experiment Video

Updated: May 28, 2026

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
12:20

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

Published on: October 5, 2013

Room Temperature Ferromagnetism Engineered in Two-Dimensional Metallic Magnets via Metal-Insulator-Semiconductor

Yiting Mo1, Yijun Huang1, Haotian Xu1

  • 1Zhejiang Key Laboratory of Energy Conversion Materials for Advanced Motor, Institute of Advanced Magnetic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China.

Nanomaterials (Basel, Switzerland)
|May 26, 2026
PubMed
Summary
This summary is machine-generated.

Researchers engineered room temperature ferromagnetism in 2D magnetic materials using dielectric layers. This silicon-compatible method enhances magnetism via charge transfer and enables optical control for spintronic devices.

Keywords:
2D magnetFe3GeTe2MIS structurecharge transferoptospintronics

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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials

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Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
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Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

Published on: October 5, 2013

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Novel information-functional devices are essential for post-Moore era integrated circuits.
  • Two-dimensional (2D) magnetic materials offer promise for spintronics but face challenges in controlling room temperature magnetism.
  • Existing methods like ionic liquid gating and strain control lack stability and silicon compatibility.

Purpose of the Study:

  • To demonstrate a straightforward and robust method for engineering room temperature ferromagnetism in 2D metallic magnets.
  • To investigate the effect of dielectric layer thickness in metal-insulator-semiconductor (MIS) structures on magnetic properties.
  • To explore the optical modulation of magnetism in these engineered systems.

Main Methods:

  • Fabrication of metal-insulator-semiconductor (MIS) structures using surface-oxidized Fe3GeTe2 and SiO(x) dielectric layers of varying thicknesses (50-300 nm).
  • Systematic investigation of magnetic properties as a function of SiO(x) dielectric layer thickness.
  • Characterization of optical modulation of magnetism under ultraviolet illumination.

Main Results:

  • Thin SiO(x) layers (50-300 nm) significantly enhance room temperature ferromagnetism via boosted interfacial charge transfer.
  • Thicker dielectric layers lead to dielectric screening effects, maintaining the material closer to its intrinsic magnetic state.
  • Reversible optical modulation of magnetism was achieved, with photoresponse diminishing as dielectric thickness increased.

Conclusions:

  • A scalable, silicon-compatible strategy for controlling 2D magnetism using dielectric engineering has been established.
  • The findings provide critical insights into interfacial charge transfer and dielectric screening effects in 2D magnetic materials.
  • This work paves the way for developing optically tunable spintronic devices and non-volatile memory applications.