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Ferromagnetism01:31

Ferromagnetism

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
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

1.2K
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...
1.2K
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

284
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...
284
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

1.0K
An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
1.0K
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

318
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...
318
Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

3.6K
Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and  the vector product of the length vector along the current element and the field due to the first conductor. According to the...
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相关实验视频

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In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
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了解在CO/氧化物界面上的电压控制的磁性异构效应.

Tomohiro Nozaki1, Jun Okabayashi2, Shingo Tamaru3

  • 1Research Center for Emerging Computing Technologies (RCECT), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, 305-8568, Japan. nozaki.tomohiro@aist.go.jp.

Scientific reports
|June 30, 2023
PubMed
概括

后化增强了电压控制磁性异构性 (VCMA) 在fcc-Co-(111) 堆中的效果. 这项研究揭示了在CO/氧化物接口上的Pt扩散增加了轨道磁矩,促进了用于自旋电子设备的VCMA.

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科学领域:

  • 这就是Spintronics.
  • 材料科学 材料科学 材料科学
  • 表面科学是一门学科.

背景情况:

  • 电压控制磁性异构性 (VCMA) 对于高速,低功率的自旋电子器件至关重要.
  • 基于Fcc-Co-(111) 的堆显示出大VCMA系数的潜力,但研究不足.
  • 在回收后的Pt/Ru/Co/CoO/TiOx结构中增强VCMA背后的机制尚不清楚.

研究的目的:

  • 研究Pt/Ru/Co/CoO/TiOx结构中的CO/氧化物接口的VCMA效应的起源.
  • 了解在后回火后观察到的电压控制强制性 (VCC) 增加背后的机制.
  • 为设计基于fcc-Co-(111) 的堆和增强的VCMA提供洞察力.

主要方法:

  • 在化前后对Pt/Ru/Co/CoO/TiOx结构进行了多探头分析.
  • 用X射线磁圆二元化 (XMCD) 测量来分析磁性质.
  • 进行了结构性表征,以了解原子的排列和扩散.

主要成果:

  • 后化显著增加了电压控制的Pt/Ru/Co/CoO/TiOx结构的强制性.
  • XMCD测量显示,在后化后,在CO/氧化物接口的轨道磁矩增加.
  • 有证据表明,Pt原子扩散到CO/氧化物接口增强了接口特性.

结论:

  • 建议将Pt扩散到CO/氧化物接口中作为增强VCMA的机制.
  • 增加的界面轨道磁矩与改善的VCMA相关.
  • 这些发现提供了一个设计策略,用于优化基于fcc-Co-(111) 的spintronic应用中的VCMA.