Control of Interface Structure for Oxides Artificial Lattices

氧化物人工晶格界面结构的控制

• 批准号: 05650313
• 负责人: ITOH Akiyoshi
• 金额: $ 1.41万
• 依托单位: Nihon University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05650313/
• 关键词: Iron oxide thin films; magnetoresistive effect; magnetic garnet films; oxides artificial lattices; perpendicular magnetic antisotropy; XAFS; XANES; Ferrite; 結晶化過程; スピネルフェライト

As one of the method for fabricating oxides artificial super lattices, alternative reactive sputtering method by using some metal targets is expected to be useful. We performed the basic investigation of deposition and oxidization of iron oxides thin films from an iron target by using Ar and Oxygen. From the XANES (X-ray absorption near edge structure) measurements, iron oxide thin films are containing Fe_3O_4 and gamma-Fe_3O_4 for the films sputtered under 4mTorr of oxygen partial pressure. The films sputteredunder 10mTorrof oxygen mainly consist of alpha-Fe_3O_4. We found a big magnetoresistive effect in the films which also show a high specific resistivity. This magnetoresistive effect is as large as 4% and it is about ten times big as the value for conventional bulk Fe_3O_4. From the structural analysis by using a transmission electron microscope, the films show a culumnar structure of Fe_3O_4 and its diameter is roughly 30-40nm.On the other hand, as one of the real multilayrs of oxides, we designed the multilayr structures of Bi-substituted iron garnet films for the purpose of megneto-optical recording media. The films are designed for having perpendicular magnetic anisotropy by utilizing the reverse magnetostrictive effect caused by the lattice mismatch between the layrs.

作为制备氧化物人工超晶格的一种方法，利用某些金属靶材的替代反应溅射方法有望得到应用。我们用Ar和氧气对铁靶沉积和氧化氧化铁薄膜进行了基础研究。XANES测试表明，在4mTorr氧分压下溅射的氧化铁薄膜中含有Fe_3O_4和γ-Fe_3O_4。在10mTorrO2下溅射的薄膜主要由α-Fe_3O_4组成。我们发现薄膜具有很大的磁阻效应，并且具有较高的比电阻率。这种磁阻效应高达4%，约为传统块体Fe_3O_4磁阻效应的10倍。从透射电子显微镜的结构分析可知，薄膜为粗大的Fe_3O_4结构，其直径约为30-40 nm。另一方面，作为真正的多层氧化物之一，我们设计了用于磁光记录介质的多层结构的铋取代铁榴石薄膜。通过利用层之间晶格失配引起的逆磁致伸缩效应，薄膜被设计成具有垂直磁各向异性。

项目成果

Kazuttoshi OHMORI,Akiyoshi ITOH,Katsuji NAKAGAWA: "RECURRENT PHOTOMAGNETIC EFFECT OF Co DOPED MAGNETIC GARNET FILMS" The Magnetics Society of Japan. 17-S1. 233-236 (1993)

Kazuttoshi OHMORI、Akiyoshi ITOH、Katsuji NAKAGAWA：“钴掺杂磁性石榴石薄膜的反复光磁效应”日本磁学学会。

Kazuttoshi OHMORI,Akiyoshi ITOH,Katsuji NAKAGAWA: "RECURRENT PHOTOMAGNETIC EFFECT OF Co DOPED MAGNETIC GARNET FILMS" The Magnetics Society of Japan. 17-SI. 233-236 (1993)

Kazuttoshi OHMORI、Akiyoshi ITOH、Katsuji NAKAGAWA：“钴掺杂磁性石榴石薄膜的反复光磁效应”日本磁学学会。

Katsuji NAKAGAWA.: "MICROSTRUCTURE AND CRYSTALLIZATION MECHANISM OF Bi-SUBSTITUTED GARNET FILMS FORM-O RECORDING PREPARED BY PYROLYSIS AND SPUTTERING(Invited)" The Magnetics Society of Japan. 17-S1. 278-283 (1993)

Katsuji NAKAGAWA.：“通过热解和溅射制备双取代石榴石薄膜 FORM-O 记录的微观结构和结晶机制（邀请）”日本磁学学会。

H.Akimoto,T.Sugimoto,K.Nakagawa,A.Itoh: "In-situ MEASUREMENT OF STRESS FOR Co/Pd MULTILAYER FILMS DURING FABRICATION BY RF-SPUTTERING" The Magnetics Society of Japan. 17-S1. 52-55 (1993)

H.Akimoto、T.Sugimoto、K.Nakakawa、A.Itoh：“通过射频溅射制造过程中 Co/Pd 多层薄膜的原位测量应力”日本磁学会。

K.Ohmori,K.Nakagawa,and A.Itoh: "WAVELENGTH DEPENDENCE OF PHOTOMAGNETIC EFFECT IN Co-DOPED MAGNETIC GARNET FILMS" IEEE Trans.Mag.(1993)

K.Ohmori、K.Nakakawa 和 A.Itoh：“共掺杂磁性石榴石薄膜中光磁效应的波长依赖性”IEEE Trans.Mag.(1993)