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関連する概念動画

Ferromagnetism01:31

Ferromagnetism

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...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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. This...
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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...
Paramagnetism01:30

Paramagnetism

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...

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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

原子規模の反鉄磁石におけるビスタビリティ

Sebastian Loth1, Susanne Baumann, Christopher P Lutz

  • 1IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120, USA. sebastian.loth@mpsd.cfel.de

Science (New York, N.Y.)
|January 17, 2012
PubMed
まとめ
この要約は機械生成です。

研究者は,鉄 (Fe) ナノ構造を用いて,磁力の原子規模の制御を実証した. これらの構造は,安定した磁気状態を示し,電気的なスイッチング機能を持つ密集した不揮発性データストレージを可能にします.

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Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
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Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

Published on: October 5, 2013

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

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関連する実験動画

Last Updated: May 25, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
12:20

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

Published on: October 5, 2013

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
07:42

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Published on: July 20, 2022

科学分野:

  • マテリアルサイエンス 材料科学
  • 凝縮物質物理学 凝縮物質物理学
  • ナノテクノロジー ナノテクノロジー

背景:

  • データストレージデバイスの小型化により,磁力の原子規模の制御が必要になります.
  • 反鉄磁性材料は,高密度の情報保存の可能性を秘めています.

研究 の 目的:

  • 数原子の反鉄磁性ナノ構造物の磁性特性を調査する.
  • 電気的なスイッチングと非揮発性データストレージを原子スケールで実証する.

主な方法:

  • 表面上の数原子の鉄 (Fe) ナノ構造物の製造.
  • 磁気状態を感知するために,スピン極化トンネリングを使用します.
  • ナノ秒の精度で磁気状態の電気操作.
  • 小さなナノ構造における磁化による量子トンネリングの観測.

主要な成果:

  • 抗鉄磁性ナノ構造は,低温で2つの安定したネール状態を示します.
  • 最小の構造で観測された磁気化の量子トンネリング.
  • ナノ秒速で達成される磁気状態間の電気的なスイッチング.
  • ナノ構造を合わせた密度の高い非揮発性情報ストレージが実証されています.

結論:

  • 反鉄磁性の原子規模の制御は達成可能である.
  • 量子現象は,ナノ構造における磁気状態の移行に影響を与えます.
  • 電気制御は,密度が高く,揮発性のないデータストレージでの実用的なアプリケーションを可能にします.