Related Experiment Video
Updated: Jun 16, 2026
09:06
Cryo-EM and Single-Particle Analysis with Scipion
Published on: May 29, 2021
4.2K
Structural tuning for enhanced magnetic performance by Y substitution in FeB-based metallic glasses
Guangcun Shan1,2, Xin Li1,2, Haoyi Tan1
1School of Instrumentation Science and Opto-electronics Engineering & Institute of Precision Instrument and Quantum Sensing, Beihang University, Beijing 100191, People's Republic of China.
Journal of Physics. Condensed Matter : an Institute of Physics Journal
|November 19, 2020
Summary
The Fe71B17Y12 metallic glass exhibits significantly higher magnetic performance than Fe71B17(NbYZr)12 due to differences in atomic structure and Fe-Fe bond distribution. This finding aids in developing advanced magnetic metallic glasses.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Magnetism
Background:
- Metallic glasses offer tunable magnetic properties.
- Compositional analogues can exhibit vastly different magnetic behaviors.
- Understanding structure-property relationships is crucial for material design.
Purpose of the Study:
- To investigate the structural origins of differing magnetic performance in Fe71B17Y12 and Fe71B17(NbYZr)12 metallic glasses.
- To elucidate the impact of substituting analogous 4d transition metals on magnetic properties.
- To provide insights for developing new magnetic metallic glasses.
Main Methods:
- X-ray absorption fine structure (XAFS) spectroscopy.
- Ab initio molecular dynamics (AIMD) simulations.
- Analysis of simulated pair-correlation function (PCF) and Voronoi tessellation.
- Application of the Heisenberg model of magnetism.
Main Results:
- Fe71B17Y12 metallic glass shows a saturated magnetization of 108 emu g⁻¹, over five times higher than Fe71B17(NbYZr)12 (20 emu g⁻¹).
- A narrow distribution of longer Fe-Fe bonds in Fe71B17Y12 leads to a large Fe magnetic moment (2.0 μB).
- A broad distribution of Fe-Fe bonds in Fe71B17(NbYZr)12 results in ferrimagnetic couplings and a small net Fe moment (0.45 μB).
Conclusions:
- Substitution of analogous 4d transition metals significantly alters magnetism in metallic glasses.
- Atomic structure, particularly Fe-Fe bond distribution, dictates magnetic performance.
- This research guides the development of magnetic metallic glasses with enhanced performance and glass-forming ability.
Related Concept Videos
01:26Diamagnetism
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.
01:28Types 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...
01:31Ferromagnetism
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...
01:17Theory of Metallic Conduction
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
01:17Magnetic Damping
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
01:27Biasing of Metal-Semiconductor Junctions
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...