在多铁基尼基酸矿YNiO3中的磁电效应
Nazaret Ortiz Hernández1, Elizabeth Skoropata1, Hiroki Ueda1
1Swiss Light Source, Paul Scherrer Institute, Forschungssrtasse 111, 5232 Villigen-PSI, Villigen, Switzerland.
概括
尼基酸盐 (YNiO3) 具有磁电效应,证实它是II型多铁材料. 一个应用的电场逆转了它的磁性结构,将磁性秩序,电荷定位和金属绝缘体过渡联系起来.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 磁力学和铁电力学
背景情况:
- 磁性秩序和自发电极化之间的合对于控制电子特性和磁性至关重要.
- 具有磁性秩序和电极化的材料对于验证理论模型具有重要意义.
- 包括尼基酸盐 (YNiO3) 在内的RNiO3家族是将金属绝缘器过渡 (MIT) 与磁和电顺序相结合的候选者.
研究的目的:
- 为了研究YNiO3中预测的电极化,YNiO3是一种以其金属绝缘体过渡和抗铁磁基本状态而闻名的材料.
- 通过实验证实带电顺序的RNiO3化合物的磁电性质.
- 探索YNiO3.3中磁性结构,电荷定位和电场效应之间的关系.
主要方法:
- 利用带有圆极化的共振磁X射线散射来探测YNiO3.3的磁性结构.
- 应用外部电场来观察其对材料磁性和电子性质的影响.
- 分析了磁体结构的自旋旋转域,表明电极化.
主要成果:
- 证明YNiO3具有具有与电极化相一致的自旋旋转域的磁性结构.
- 在应用电场时观察到磁结构的反转.
- 证实了YNiO3.3中电荷顺序,金属绝缘器过渡和磁电合的共存.
结论:
- 尼基酸盐 (YNiO3) 表现出II型多铁性行为,其特点是磁电合.
- 该研究证实了磁性秩序,电荷定位和RNiO3材料中的金属绝缘体过渡之间的联系.
- 这些发现验证了YNiO3作为一种有前途的材料,用于探索基于磁电合的基本物理和潜在的设备应用.
更多相关视频
相关概念视频
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
Paramagnetism
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
Diamagnetism
2.4K
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....
2.4K
Magnetic Susceptibility and Permeability
1.0K
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...
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...
1.0K
Potential Due to a Magnetized Object
266
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...
The vector...
266
Atomic Nuclei: Magnetic Resonance
639
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...
639


