Preparation and Caracterization of Electrodeposited Magnetic Multilayrs

电沉积磁性多层膜的制备与表征

• 批准号: 08455323
• 负责人: HAYASHI Yasunori
• 金额: $ 4.93万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455323/
• 关键词: Metallic Artificial Superlattice; Electrodeposition; Magnetic Mutilayr; Giant Magnetoresistance; Perpendicular Magnetic Anisotropy; 反射電子顕微鏡法

Since the discovery of not only perpendicular magnetic anisotropy and magneto-optical Kerr effect but also giant magnetoresistance in metallic multilayrs, interest in magnetic multilayred nanostructures has been greatly stimulated. Most magnetic nanostructured films have been fabricated by sputtering or molecular beam epitaxy, which have proved to be the most suitable for the controlled preparation of high-quality structures on an atomic scale. In this work we reveal that electrodeposition will prove to be a promising candidate for the preparation of magnetic nanosructures, which depend on the deposition overpotential and hence the growth mechanism. Cross-sectional transmission electron microscopy, X-ray diffraction, energy dispersive X-ray analysis, and Auger electron spectoscopy have provided evidence for composition modulation across successive layrs in Co/Pt and Co/Cu nanometer-multilayred structures prepared by electrodeposition under potential control. Multilayred Co/Pt nanostructures grown on a Cu (111) substrate exhibit a remanent perpendicular magnetization and a large coercivity. Giant magnetoresistance and oscillatory antiferromagnetic interlayr coupling have been observed in a (111) fcc textured Co/Cu multilayred nanostructure. Moreover, a large saturation magnetoresistance of more than 20% has been achieved at room temperature for a heterogeneous Co-Cu alloy, which consists of ultrathin fcc Co-rich clusters in a nonmagnetic Cu matrix. This value is comparable to those previously reported in vapor-deposited superlattices as well as heterogeneous alloys. Further studies on the crystallization kinetics of nucleation and growth under precise overpotential control are necessary to achieve improved structural and magnetic qualities in the electrodeposited nanostructures.

自从金属多层膜中垂直磁各向异性和磁光克尔效应以及巨磁阻的发现以来，人们对磁性多层纳米结构的兴趣极大地激发了。大多数磁性纳米结构薄膜是通过溅射或分子束外延制造的，这已被证明最适合在原子尺度上控制制备高质量结构。在这项工作中，我们揭示了电沉积将被证明是制备磁性纳米结构的有前途的候选者，这取决于沉积过电势，因此取决于生长机制。截面透射电子显微镜、X射线衍射、能量色散X射线分析和俄歇电子能谱为电势控制下电沉积制备的Co/Pt和Co/Cu纳米多层结构中连续层的成分调制提供了证据。在 Cu (111) 基底上生长的多层 Co/Pt 纳米结构表现出剩余垂直磁化强度和大矫顽力。在 (111) fcc 织构的 Co/Cu 多层纳米结构中观察到巨磁阻和振荡反铁磁层间耦合。此外，异质Co-Cu合金在室温下实现了超过20%的大饱和磁阻，该合金由非磁性Cu基体中的超薄面心立方富钴簇组成。该值与之前报道的气相沉积超晶格以及异质合金的值相当。为了改善电沉积纳米结构的结构和磁性质量，有必要对精确过电势控制下的成核和生长的结晶动力学进行进一步研究。

项目成果

Yasunori Hayashi: "Preparation and Characterization of Electrodeposited Metallic Multilayrs" Physica B,Condensed Matter. Vol.239 Nos.1-2. 35-40 (1997)

Yasunori Hayashi：“电镀金属多层膜的制备和表征”Physica B，凝聚态物质。

Yasunori Hayashi: "Preparation and Characterization of Electrodeposited Metallic Multilayers" Physica B,Condensed Matter. 239・1. 35-40 (1997)

Yasunori Hayashi：“电镀金属多层膜的制备和表征”Physica B，Condensed Matter 239・1（1997）。

Yukimi Jyoko: "Preparation of Giant Magnetoresistance Co-Cu Heterogeneous Alloys by Electrodeposition" J.Electrochem.Soc.Vol.144 No.7. L193-L195 (1997)

Yukimi Jyoko：“通过电镀制备巨磁阻Co-Cu异质合金”J.Electrochem.Soc.Vol.144 No.7。

Yukimi Jyoko: "Preparation and Characterization of Electrodeposited Pt/Co Multilayers" J.Magn.Magn.Mater.156・1. 35-37 (1996)

Yukimi Jyoko：“电镀 Pt/Co 多层膜的制备和表征”J.Magn.Magn.Mater.156・1（1996）。

常光幸美: "電析金属多層膜の構造と特性" 表面技術. 47・12. 1025-1028 (1996)

幸见常光：“沉积金属多层膜的结构和性能”表面技术47・128（1996）。