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Ferromagnetism

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...

Potential Due to a Magnetized Object

Potential Due to a Magnetized Object

Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...

π Electron Effects on Chemical Shift: Overview

π Electron Effects on Chemical Shift: Overview

An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...

Paramagnetism

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...

Valence Bond Theory

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

Imperfections in Crystal Structure: Stoichiometric Point Defects

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...

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Related Experiment Video

Updated: May 25, 2026

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Published on: June 9, 2023

Defect induced magnetism in highly oriented pyrolytic graphite: bulk magnetization and 19F hyperfine interaction

S K Mohanta¹, S N Mishra, S M Davane

¹Department of Nuclear and Atomic Physics, Tata Institute of Fundamental Research, Mumbai, India.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|January 27, 2012

Summary

Defect-induced magnetism was investigated in irradiated graphite. Bulk properties suggest ferromagnetism, but local measurements indicate paramagnetism, likely due to surface defects.

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Last Updated: May 25, 2026

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

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Published on: June 9, 2023

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Published on: July 20, 2022

Area of Science:

Materials Science
Condensed Matter Physics
Nuclear Physics

Background:

Highly oriented pyrolytic graphite (HOPG) is a key material for electronic applications.
Understanding defect-induced magnetism is crucial for tailoring material properties.

Purpose of the Study:

To investigate defect-induced magnetism in HOPG after carbon beam irradiation.
To correlate bulk magnetic properties with local magnetic responses.

Main Methods:

Bulk magnetic property measurements.
Local magnetic response studies using gamma-ray time differential perturbed angular distribution (TDPAD) with recoil-implanted fluorine-19.
Ab initio density functional calculations.

Main Results:

Bulk magnetic measurements showed characteristics of room temperature ferromagnetism.
Local hyperfine field data indicated enhanced paramagnetism, with no evidence of long-range magnetic ordering.
Computational studies supported the experimental findings.

Conclusions:

The observed ferromagnetic response in irradiated HOPG is attributed to defect-induced magnetic moments in carbon atoms near the surface.
Deeper regions of the graphite matrix remain paramagnetic.