関連する実験動画
Updated: Feb 24, 2026

07:03
Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
Published on: August 15, 2018
9.3K
ディスプロソセニウムで60ケルビンでの分子磁気ヒステレス
Conrad A P Goodwin1, Fabrizio Ortu1, Daniel Reta1
1School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
Nature
|August 25, 2017
まとめ
研究者は60ケルビンまでの磁気ヒステリシスを示す新しいディスプロシウム複合体を開発した. この画期的な発見により 分子磁気データストレージが進歩し 液体窒素より高い温度でのストレージが可能になります
科学分野:
- 材料科学
- 量子コンピューティング
- ナノテクノロジー
背景:
- ランタノイドは量子情報と 分子スケールのデータストレージのために探求されています
- シングル分子磁石 (SMM) は磁気ヒステリシスを示すが,通常は低温で動作する.
- 以前のSMMは,緩やかなスイープ速度で,限られたヒステレス温度を達成しました.
研究 の 目的:
- マグネティック・ヒステリシスを大幅に強化したランタナイドベースの単分子磁石を開発する.
- 高温での分子磁気データの保存の可能性を調査する.
主な方法:
- ヘクサ-テルト-ブティルディスプロセニウム複合体の合成: [Dy(Cpttt) 2][B(C6F5) 4.
- 磁気ヒステリシス特性を決定する磁気特性.
- 変数温度磁気測定とリラックスダイナミクス研究
- スピンダイナミクスとリラクゼーションメカニズムをモデル化する Ab initio 計算.
主要な成果:
- 合成されたディスプロシウム複合体は 磁気ヒステリシスを60ケルビンまで示し 秒速22オースデットでスイープしました
- リラクゼーションのダイナミクスの明確な変化が60ケルビンで観察され,稀なサンプルでは持続した.
- Ab initio計算では,局所的な分子振動が高温の磁気放緩の原因であることを確認しました.
結論:
- 新型ディスプロシウム複合体は SMMにとって前例のない高温磁気ヒステリースを示しています.
- ディスプロシウム複合体に特有の局所化された金属-リガンド振動モードは,高温磁気メモリを達成するための鍵です.
- 理性的な分子設計は 単一分子磁気データストレージを 液体窒素より高い温度で実現する見込みです
関連する概念動画
Ferromagnetism
3.2K
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...
3.2K
¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR
1.7K
The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
1.7K
Paramagnetism
3.1K
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...
3.1K
Magnetic Susceptibility and Permeability
2.5K
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...
2.5K
π Electron Effects on Chemical Shift: Overview
1.7K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
1.7K
Spin–Spin Coupling Constant: Overview
1.6K
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
1.6K

