Related Experiment Video
Updated: Mar 16, 2026
07:42
Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
Published on: July 20, 2022
3.5K
Assembly of Superparamagnetic Filaments in External Field
Jiachen Wei1,2, Fan Song1,2, Jure Dobnikar3,4
1State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences , 15 Beisihuanxi Road, Beijing 100190, China.
Langmuir : the ACS Journal of Surfaces and Colloids
|August 19, 2016
Summary
We studied magnetic filaments that fold into complex shapes like loops and sheets when exposed to a magnetic field. This research offers insights into creating responsive, self-assembling materials.
Area of Science:
- Soft matter physics
- Materials science
- Biophysics
Background:
- Magneto-elastic filaments offer tunable properties for advanced materials.
- Understanding their self-assembly under external fields is crucial for designing functional structures.
Purpose of the Study:
- To theoretically and computationally investigate the steady-state structures of magneto-elastic filaments.
- To explore how filament composition and bending rigidity influence morphology in an external magnetic field.
Main Methods:
- Theoretical modeling of magneto-elastic interactions.
- Computer simulations of filament behavior under magnetic fields.
- Analysis of phase diagrams and emergent morphologies.
Main Results:
- Filaments exhibit diverse steady-state structures including bent filaments, loops, sheets, and helicoids.
- Morphologies are dictated by the interplay between elastic forces and induced magnetic interactions.
- A rich phase behavior is observed, influenced by filament composition and bending rigidity.
Conclusions:
- The study reveals complex folding behaviors in magneto-elastic filaments driven by external magnetic fields.
- Findings provide a foundation for designing hierarchically assembled supramolecular structures with tunable responses.
- This work contributes to the field of stimuli-responsive materials and soft robotics.
Related Concept Videos
01:27Magnetic Fields
7.7K
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.
A magnetic field is defined by the force that a charged particle experiences...
A magnetic field is defined by the force that a charged particle experiences...
7.7K
01:31Ferromagnetism
3.4K
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...
3.4K
01:30Paramagnetism
3.1K
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...
3.1K
01:26Diamagnetism
3.2K
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....
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....
3.2K
01:18Magnetic Field Due to Two Straight Wires
5.1K
Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
5.1K
01:23Atomic Nuclei: Nuclear Relaxation Processes
1.3K
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.
1.3K