CoFe2O4 Nanoparticle-Integrated Spin-Valve Thin Films Prepared by Interfacial Self-Assembly,The Journal of Physical Chemistry C

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CoFe2O4 Nanoparticle-Integrated Spin-Valve Thin Films Prepared by Interfacial Self-Assembly
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2017-09-28 00:00:00 , DOI: 10.1021/acs.jpcc.7b07242
Chengpeng Jiang ₁ , Ping Hoi Chan ₁ , Chi Wah Leung ₂ , Philip W. T. Pong ₁

Affiliation

We report the fabrication of nanoparticle-integrated spin-valve system and investigate its magnetic properties and magnetotransport behaviors. Using a modified interfacial self-assembly method, chemically synthesized CoFe₂O₄ nanoparticles were assembled as a Langmuir film on liquid/air interface. This film was further deposited on the sputtered thin films of bottom-pinned spin valve without additional treatment. The nanoparticle-assembled film with multilayer structure exhibits uniform and compact surfaces. Magnetization and magnetoresistance study show that the integrated nanoparticles give rise to a reduced interlayer coupling field and an increased magnetoresistance (MR) ratio in the spin valve. By analyzing the magnetic interaction between the nanoparticles and the spin valve, it is inferred that the magnetic stray field induced by the single-domain magnetic nanoparticles reduces the external magnetic field on the free layer, leading to the change of free-layer magnetization and the attenuation of interlayer coupling. The decrease of this ferromagnetic-type interlayer coupling resulted in a more favorable antiparallel magnetization configuration, manifested by the enhancement of MR ratio. This work demonstrates the integration of self-assembled nanoparticles with exchange-biased thin films, and the results suggest that nanoparticle integration can be employed as an alternative route to modulate the magnetization switching and magnetoresistance of spin valves.

中文翻译：

界面自组装制备CoFe ₂ O ₄纳米颗粒自旋阀薄膜

我们报告纳米粒子集成自旋阀系统的制造，并调查其磁性能和磁传输行为。使用改进的界面自组装方法，化学合成CoFe ₂ O ₄纳米颗粒在液体/空气界面上组装成Langmuir膜。将该膜进一步沉积在底部固定的旋转阀的溅射薄膜上，而无需另外的处理。具有多层结构的纳米颗粒组装膜表现出均匀且致密的表面。磁化和磁阻研究表明，集成的纳米颗粒在自旋阀中引起减小的层间耦合场和增加的磁阻（MR）比。通过分析纳米粒子与自旋阀之间的磁性相互作用，可以推断出单畴磁性纳米粒子所感应的杂散磁场会减小自由层上的外部磁场，从而导致自由层磁化强度和磁导率的变化。层间耦合的衰减。铁磁型层间耦合的减少导致更有利的反平行磁化构型，这表现为MR比的提高。这项工作证明了自组装纳米颗粒与交换偏置薄膜的集成，结果表明纳米颗粒集成可以用作调节自旋阀的磁化转换和磁阻的替代途径。

更新日期：2017-09-28

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