Related Experiment Video
Updated: Mar 14, 2026
07:14
Iron Nanowire Fabrication by Nano-Porous Anodized Aluminum and its Characterization
Published on: October 6, 2019
9.1K
Magnetic interactions in compositionally modulated nanowire arrays
Ester M Palmero1, Fanny Béron, Cristina Bran
1Institute of Materials Science of Madrid, CSIC, 28049 Madrid, Spain.
Nanotechnology
|September 24, 2016
Summary
This study investigated how layer thickness affects magnetic nanowires. Thicker non-ferromagnetic layers and longer ferromagnetic segments enhance coercivity and reduce magnetic interactions.
Area of Science:
- Materials Science
- Nanotechnology
- Magnetism
Background:
- Fabrication of compositionally modulated nanowire arrays using electroplating into anodic aluminum oxide membranes.
- Nanowires with a constant diameter of 35 nm and varying Cu (non-ferromagnetic, NFM) and FeCoCu (ferromagnetic, FM) segment thicknesses were synthesized.
Purpose of the Study:
- To determine the influence of NFM layer and FM segment thickness on magnetic properties, specifically coercivity and magnetic interactions.
- To quantify the impact of inter-/intra-nanowire magnetostatic interactions on coercivity and interaction field distributions.
Main Methods:
- First-order reversal curve (FORC) measurements.
- Computational simulations.
- Analysis of coercivity and interaction field distributions.
Main Results:
- FORC coercivity increases with thicker NFM layers due to FM segment decoupling and with longer FM segments due to increased shape anisotropy.
- Interaction field significantly reduces with thicker NFM layers and thinner FM segments, linked to NFM/FM thickness ratio and FM segment decoupling.
Conclusions:
- Nanowire magnetic properties are tunable by controlling NFM and FM layer thicknesses.
- Understanding magnetostatic interactions is crucial for designing nanowire-based magnetic devices.
Related Concept Videos
01:28Magnetic Field Due To A Thin Straight Wire
6.5K
Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
6.5K
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
01:26Diamagnetism
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
01:30Paramagnetism
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
01:31Ferromagnetism
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
03:02Colors and Magnetism
14.4K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
14.4K