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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...

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...

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...

Diamagnetism

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....

Atomic Nuclei: Nuclear Relaxation Processes

Atomic Nuclei: Nuclear Relaxation Processes

In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis.

Magnetic Susceptibility and Permeability

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: Sep 14, 2025

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

Spatiotemporal Modulation of Magnetization in Magnetic Soft Materials.

Qiyu Deng¹, Hegeng Li¹, Hengjia Zhu¹

¹Department of Mechanical Engineering, The University of Hong Kong, Hong Kong SAR, 999077, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)

|July 22, 2025

Summary

This review explores magnetic soft materials and spatiotemporal magnetization modulation. It details methods for controlling magnetization and highlights applications in fluid manipulation, biomedical engineering, and wearable electronics.

Keywords:

magnetic soft materials magnetization modulation sensors soft robots

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Area of Science:

Materials Science
Soft Robotics
Magnetism

Background:

Magnetic soft materials offer unique properties like untethered manipulation and mechanical compliance.
Spatiotemporal magnetization modulation is key for self-actuation and external magnetic field generation in these materials.

Purpose of the Study:

To provide a comprehensive review of spatiotemporal magnetization modulation in magnetic soft materials.
To bridge the gap in literature regarding this specific aspect of magnetic soft materials.

Main Methods:

Introduction to fundamental components of magnetic soft materials.
Exploration of diverse strategies for spatial and spatiotemporal magnetization modulation.
Review of existing literature and research findings.

Main Results:

Detailed overview of techniques for controlling magnetization in soft materials over space and time.
Identification of critical parameters influencing magnetic soft material behavior.
Synthesis of current knowledge on magnetization modulation strategies.

Conclusions:

Magnetic soft materials are advancing rapidly due to sophisticated fabrication and control.
Spatiotemporal magnetization modulation is essential for unlocking the full potential of these materials.
Future applications span fluidics, biomedical devices, and advanced wearables.