Investigations of nano magnetic structures and surface electronic States by spin-polarized scanning tunneling spectroscopy

自旋极化扫描隧道光谱研究纳米磁性结构和表面电子态

• 批准号: 15310075
• 负责人: KAWAGOE Takeshi
• 金额: $ 8.26万
• 依托单位: Osaka-Kyoiku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15310075/
• 关键词: spin-polarized scanning tunneling spectroscopy; spin-polarized surface states; layered antiferromagnetic oder; spiral terraces; screw dislocations; spin frustration; マイクロマグネティクシミュレーション; 反強磁性磁区; スピン偏極トンネル分光; Cr(001)清浄表面; トンネル磁気抵抗効果

The initial targets of this projects are 1)establishment of ultrahigh vacuum spin-polarized scanning tunneling spectroscopy (SP-STS) and 2)magnetic imaging of Cr and Fe(001) films by SP-STS. We finished the establishment of our experimental apparatus of UHV-SP-STS within the first year and we could get several scientific achievements.The scientific achievements of this 3 years projects by spin-polarized scanning tunneling spectroscopy can be summarized as follows : 1)Evidence of a layered antiferromagnetic order on ultrathin Cr (001) films (<5nm) 2)Consequences of structural defects of steps and screw dislocations on magnetic ordering of the Cr (001) film surface 3)Growth and surface states of ultrathin Fe flints on Cr(001).The most important scientific achievement is "a successful fabrication of high-density spiral terraces on Cr (001) films (9nm in thickness) and their magnetic imaging" Spin frustration and asymmetric magnetic ordering due to dense spiral terraces are observed. Sizable modification of the layered antiferromagnetic order is found to be originating from the topological asymmetry as confirmed by the continuum micromagnetic simulation.The scientific achievements of this 3 years projects were already published on Physical Review Letters, Physical Review B, and Journal of Applied Physics et al. (total 6 papers) and presented the international conferences and domestic meetings (total 20 presentations), including 2 invited talks on the international conferences and 6 invited talks on domestic meetings.

本项目的初步目标是：1)建立超高真空自旋极化扫描隧道光谱（SP-STS）； 2)利用SP-STS对Cr和Fe（001）薄膜进行磁成像。我们在第一年就完成了UHV-SP-STS实验装置的建立，并取得了一些科研成果。本项目3年的自旋极化扫描隧道光谱研究成果总结如下：1)超薄Cr（001）薄膜（<5nm）表面存在层状反铁磁有序的证据；2)台阶结构缺陷和螺旋位错对Cr（001）薄膜表面磁有序的影响；3)Cr（001）上超薄铁火石的生长和表面态。最重要的科学成就是“在厚度为9nm的Cr（001）薄膜上成功制备了高密度螺旋阶地及其磁成像”，观察到密集螺旋阶地导致的自旋受挫和不对称磁有序。连续微磁模拟证实了层状反铁磁有序的相当大的改变是由拓扑不对称引起的。该项目历时3年的科研成果已在《物理评论快报》、《物理评论B》、《应用物理杂志》等刊物上发表（共6篇），并在国际会议和国内会议上发表（共20篇），其中国际会议特邀演讲2次，国内会议特邀演讲6次。

项目成果

Surface magnetism of Cr(001) films by spin-polarized scanning tunneling spectroscopy

自旋偏振扫描隧道光谱研究 Cr(001) 薄膜的表面磁性

• 发表时间: 2005
• 期刊: Journal of the Surface Science Society of Japan (Hyoumen Kagaku) Vol.26, No.1
• 作者: T.Kawagoe;Y.Iguchi;T.Miyamachi;A.Yamasaki;S.Suga;Takeshi Kawagoe
• 通讯作者: Takeshi Kawagoe

スピン偏極トンネル分光法によるCr(001)薄膜の表面磁性

自旋极化隧道光谱法研究 Cr(001) 薄膜的表面磁性

• 发表时间: 2005
• 期刊: 表面科学 26・1
• 作者: T.Kawagoe;Y.Iguchi;A.Yamasaki;Y.Suzuki;K.Koike;S.Suga;川越 毅
• 通讯作者: 川越 毅

Surface nanomagnetism on Fe and Cr(001)

Fe 和 Cr(001) 的表面纳米磁性

• 发表时间: 2003
• 期刊: Ouyobuturi (in Japanese) Vol.72, No.5
• 作者: T.Kawagoe;Y.Suzuki
• 通讯作者: Y.Suzuki

Evidence of a topological antiferromagnetic order on ultrathin Cr(001) film surface studied by spin-polarized scanning tunneling spectroscopy

• DOI: 10.1063/1.1557352
• 发表时间: 2003-05-15
• 期刊: JOURNAL OF APPLIED PHYSICS
• 影响因子: 3.2
• 作者: Kawagoe, T;Suzuki, Y;Koike, K
• 通讯作者: Koike, K

FeおよびCr(001)薄膜の表面ナノ磁性 -スピン偏極トンネル分光法による観察-

Fe和Cr(001)薄膜的表面纳米磁性-自旋偏振隧道光谱观察-

• 发表时间: 2003
• 期刊: 応用物理 72・5
• 作者: 川越 毅;鈴木義茂
• 通讯作者: 鈴木義茂