Tailoring Ferrimagnetic Properties Using Proximity Effects in Co/Tb-Co Bilayers

IF 4.4 3区 材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Daniel Kiphart, Gabriel David Chaves O'Flynn, Feliks Stobiecki, Łukasz Frąckowiak, Michał Matczak, Piotr Kuświk
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Abstract

The presence of two magnetic sublattices in ferrimagnetic rare-earth-transition metal alloys enables the tuning of their magnetic properties by adjusting the film composition (e.g., magnetization, coercivity, as well as compensation and Curie temperatures). Using both experimental techniques and atomistic simulations, the magnetic properties of Co/(Tb-Co) bilayers are studied across a broad range of parameters, including the thicknesses of the two layers and the composition of the alloy layer. This work demonstrates the ability to precisely modify the compensation point of Tb-Co alloy thin films by adding a Co underlayer with a specified thickness. Furthermore, the range of parameters are identified for which the magnetization reversal of the alloy and Co layers occurs synchronously and provides a simple expression for calculating the effective composition of the bilayer system. Additionally, it is shown that an exchange-spring magnet behavior can emerge when the alloy is Tb-dominant and the Co underlayer thickness exceeds a critical threshold. It is also demonstrated that for Tb concentrations where the alloy layer is expected to be paramagnetic, the exchange coupling with the Co layer locally induces ferrimagnetic order near the interface, leading to a second transition back to Co dominance.

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利用Co/Tb-Co双分子层的接近效应裁剪铁磁性能
铁磁性稀土过渡金属合金中存在两个磁性亚晶格,可以通过调整薄膜成分(例如磁化强度、矫顽力以及补偿和居里温度)来调整其磁性能。利用实验技术和原子模拟,在广泛的参数范围内研究了Co/(Tb-Co)双层的磁性能,包括两层的厚度和合金层的组成。这项工作证明了通过添加特定厚度的Co衬底层来精确修改Tb-Co合金薄膜补偿点的能力。此外,还确定了合金层和钴层磁化反转同步发生的参数范围,并为计算双层体系的有效成分提供了一个简单的表达式。此外,当合金以tb为主且Co下层厚度超过临界阈值时,会出现交换弹簧磁铁行为。结果还表明,在合金层为顺磁性的Tb浓度下,与Co层的交换耦合在界面附近局部诱导铁磁有序,导致第二次转变回Co主导。
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来源期刊
Advanced Materials Interfaces
Advanced Materials Interfaces CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
8.40
自引率
5.60%
发文量
1174
审稿时长
1.3 months
期刊介绍: Advanced Materials Interfaces publishes top-level research on interface technologies and effects. Considering any interface formed between solids, liquids, and gases, the journal ensures an interdisciplinary blend of physics, chemistry, materials science, and life sciences. Advanced Materials Interfaces was launched in 2014 and received an Impact Factor of 4.834 in 2018. The scope of Advanced Materials Interfaces is dedicated to interfaces and surfaces that play an essential role in virtually all materials and devices. Physics, chemistry, materials science and life sciences blend to encourage new, cross-pollinating ideas, which will drive forward our understanding of the processes at the interface. Advanced Materials Interfaces covers all topics in interface-related research: Oil / water separation, Applications of nanostructured materials, 2D materials and heterostructures, Surfaces and interfaces in organic electronic devices, Catalysis and membranes, Self-assembly and nanopatterned surfaces, Composite and coating materials, Biointerfaces for technical and medical applications. Advanced Materials Interfaces provides a forum for topics on surface and interface science with a wide choice of formats: Reviews, Full Papers, and Communications, as well as Progress Reports and Research News.
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