单相L10-有序的高透薄膜,具有高磁性无极性
Willie B Beeson1, Dinesh Bista1, Huairuo Zhang2,3
1Physics Department, Georgetown University, Washington, DC, 20057, USA.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|June 29, 2024
概括
高合金 (HEAs) 为没有稀土的磁性材料提供了一条道路. 快速的热化FeCoNiMnCuPt HEA薄膜诱导一个单一的L10阶段,显著提高磁性异构性.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 磁力学 磁力学 是一种
背景情况:
- 高合金 (HEAs) 拥有庞大的组成空间,可以发现具有独特性质的新型材料相.
- 对于先进的技术应用来说,开发具有高磁性异质性的无稀土磁性材料至关重要.
- 控制薄膜合金中的相位形成和磁性特性需要精确的加工技术.
研究的目的:
- 探索单相高合金薄膜的潜力,以实现没有稀土的高磁性异构性.
- 研究快速热 (RTA) 对基于FeCoNiMnCu的HEAs相结构和磁性质的影响.
- 确定合并 (Pt) 是否可以诱导特定的有序相,并增强磁性异性质.
主要方法:
- 制造FeCoNiMnCu和FeCoNiMnCuPt薄膜,在室温下在Si/SiO2基板上使用喷涂.
- 沉积后的快速热 (RTA) 诱导相变.
- 使用X射线衍射和测量磁性特性,包括强制性,对膜相的表征.
主要成果:
- 作为沉积的FeCoNiMnCu薄膜是磁性软的 (强迫力~10 Oe).
- 对于FeCoNiMnCu薄膜,RTA处理导致单个面部中心立方相,使强制性增加约40倍.
- 包括50at.% Pt和随后的RTA导致单个L1高金属间相的排序,产生高磁性异构性和强制性增加三级.
结论:
- 快速热是一种有效的方法来控制相位形成并增强高合金中的磁性.
- 该FeCoNiMnCuPt系统展示了一个有希望的无稀土方法,以实现高磁性异性质材料.
- 在HEAs中形成L10阶段是开发先进磁性应用的可行策略.
更多相关视频
12:20Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
Published on: October 5, 2013
14.6K
06:49Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates
Published on: April 12, 2019
7.6K
相关概念视频
01:31Ferromagnetism
2.4K
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...
2.4K
01:30Paramagnetism
2.5K
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...
2.5K
01:05Atomic Nuclei: Magnetic Resonance
644
The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
644
03:02Colors and Magnetism
11.6K
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...
11.6K
01:02¹H NMR: Interpreting Distorted and Overlapping Signals
1.0K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.0K
01:23Atomic Nuclei: Nuclear Relaxation Processes
644
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.
644