室温近くの単相磁気電気のための層状金属有機構造における非対称なNi-中心の{NiN2O4}八面体の構築
Kaihui Mao1, Jinlei Zhang1,2, Zijing Guo1
1National Laboratory of Solid State Microstructures and Key Laboratory of Modern Acoustics, MOE, Institute of Acoustics, Nanjing University, Nanjing 210093, P. R. China.
Journal of the American Chemical Society
|July 1, 2020
まとめ
研究者らは,室温の磁電マルチフェロ特性を示す新しい層状金属有機構造 (LMOS) を開発した. この突破は,電場による磁気領域の制御を可能にすることで,高度なナノ電子機器の可能性を秘めています.
科学分野:
- 材料科学
- 凝縮物質物理学
- ナノテクノロジー
背景:
- 層状金属有機構造 (LMOS) は,ナノエレクトロニクスにおける磁気電気 (ME) マルチフェロイクスの開発に不可欠である.
- 室温,単相MEマルチフェロアイクスの達成における課題は,低トランジション温度,劣った極化,および弱いMEカップリングである.
研究 の 目的:
- 室温に近いフェロ電気とフェロ磁性を持つ新しいLMOSを構築する.
- 新しいLMOSの磁気結合効果とドメイン操作能力を調査する.
主な方法:
- ディフェニララニンとNi ((II) を使って層状の金属有機構造を合成する.
- 室温 (283 K) 近くにおける鉄電気および鉄磁性特性の特徴
- 251 Kで変化する磁場 (02 T) に対する磁電極化反応の測定.
主要な成果:
- 室温近くで観察された自発的およびヒステリックな鉄電性と鉄磁気性.
- 強い磁場依存のME偏振が示され,低磁場でも制御が可能である.
- 磁場操作は283Kで確認した
- アシンメトリック・オクタエドール・ディストーションが 極化とME効果の鍵だと判明した.
結論:
- 開発されたLMOSは,室温の単相有機MEマルチフェロイドへの重要な進歩を表しています.
- 非対称的な歪みメカニズムは,改良された特性を持つ将来のマルチフェロ材料を設計するための経路を提供します.
関連する概念動画
01:31Ferromagnetism
2.9K
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...
2.9K
02:42Valence Bond Theory
10.8K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
10.8K
02:37Metallic Solids
20.3K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
20.3K
03:02Colors and Magnetism
13.6K
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...
13.6K