Microstructure and Magnetic Properties of Exchange-Coupled Co72Pt28/Pt/Co81Ir19 Composite Media for Perpendicular Magnetic Recording

Li, Z. W.; Jiao, Jianxin; Luo, Zhihao; Y., T.; Qiao, Lihong; Wang, Y.; Wang, T.; Li, F. S.

doi:10.1007/s10948-018-4953-8

Cited by 6 publications

(4 citation statements)

References 38 publications

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“…Magnetic binary alloys based on FePt, CoPt, FePd and MnAl are promising materials for prospective spintronic and permanent magnet applications [1,2]. Specifically, Co-Pt alloys are attractive as a material for permanent magnets [3] and exchange coupled composites [4] because of high and tunable coercivity combined with an excellent corrosion resistance [5]. There are several phases, which could be formed in Co-Pt binary alloys, revealing distinct magnetic properties: i.e.…”

Section: Introductionmentioning

confidence: 99%

Homogenization and short-range chemical ordering of Co–Pt alloys driven by the grain boundary migration mechanism

Pedan

Makushko

Dubikovskyi

et al. 2022

J. Phys. D: Appl. Phys.

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Binary magnetic alloys like Co-Pt are relevant for applications as components of magnetic exchange coupled composites. Numerous approaches exist to tune the coercive field of Co-Pt alloys primarily relying on high temperature processing aiming to realize chemically long-range ordered phases. The peculiarity of Co-Pt is that large coercive field and magnetic anisotropy can be achieved even in chemically disordered alloys relying on short-range order. Here, we study alloying of Co-Pt from bilayers of Pt(14 nm)/Co(13 nm) at temperatures up to 550°С, where bulk diffusion processes are suppressed and the dominant diffusion mechanism is grain boundary migration. We demonstrate that grain boundary diffusion mechanism can lead to the realization of a homogeneous yet chemically disordered Co56Pt44 alloy at temperatures of 500°С and higher. A pronounced increase of the coercive field for samples processed at temperatures higher than 400°С is attributed to short-range ordering. With this work, we pinpoint the grain boundary diffusion as the mechanism responsible not only for the homogenization of binary alloy films but also as a driving force for the realization of short-range order in Co-Pt. Our results motivate further research on grain boundary diffusion as a mechanism to realize chemically long-range ordered phases in Co-Pt alloys.

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Section: Introductionmentioning

confidence: 99%

Homogenization and short-range chemical ordering of Co–Pt alloys driven by the grain boundary migration mechanism

Pedan

Makushko

Dubikovskyi

et al. 2022

J. Phys. D: Appl. Phys.

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“…[ 113 ] A better understanding of the interfacial effect will be helpful in gaining more structural insights into ferroelectric nanocomposites and assist in designing high‐performance nanocomposites. Unfortunately, it is a grand challenge to directly observe the physical and chemical properties of the interfacial regime (such as local polarization, space charge density, [ 247 ] chemical mapping of the interfacial coupling, and electric field distribution). Recently, Peng et al .…”

Section: Challenges and Future Opportunitiesmentioning

confidence: 99%

Polymer‐/Ceramic‐based Dielectric Composites for Energy Storage and Conversion

Zhuo

Qiao

et al. 2022

Energy & Environ Materials

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Dielectric composites boost the family of energy storage and conversion materials as they can take full advantage of both the matrix and filler. This review aims at summarizing the recent progress in developing high‐performance polymer‐ and ceramic‐based dielectric composites, and emphases are placed on capacitive energy storage and harvesting, solid‐state cooling, temperature stability, electromechanical energy interconversion, and high‐power applications. Emerging fabrication techniques of dielectric composites such as 3D printing, electrospinning, and cold sintering are addressed, following by highlighted challenges and future research opportunities. The advantages and limitations of the typical theoretical calculation methods, such as finite‐element, phase‐field model, and machine learning methods, for designing high‐performance dielectric composites are discussed. This review is concluded by providing a brief perspective on the future development of composite dielectrics toward energy and electronic devices.

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“…Magnetic thin films play a decisive role in magnetic data storage and numerous sensor applications. For instance, ferromagnetic chemically ordered L1 0 -CoPt thin films are promising candidate materials for magnetic tunnel junctions [1,2], high-density hard disk drives [3], nanoscaled permanent magnets [4], and exchange-coupled composites [5,6]. In particular, recent studies of CoPt alloys are devoted to their application as spin valves and transistors [7][8][9][10], spin orbit torque devices [11], investigation of magneto-plasmonic phenomena [12,13], and skyrmions formation [14].…”

Section: Introductionmentioning

confidence: 99%

Low-temperature diffusion in thin-film Pt-(Au-)-Co heterostructures: a structural and magnetic characterization

Pedan,

Makushko,

Yavorskyi

et al. 2024

Nanotechnology

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Formation of functional thin films for nanoelectronics and magnetic data storage via thermally induced diffusion-driven structural phase transformations in multilayer stacks is a promising technology-relevant approach. Ferromagnetic thin films based on CoPt alloys are considered as a material science platform for the development of various applications such as spin valves, spin orbit torque devices, and high-density data storage media. Here, we study diffusion processes in Pt-Co-based stacks with the focus on the effect of layers inversion (Pt/Co/substrate vs. Co/Pt/substrate) and insertion of an intermediate Au layer on the structural transitions and magnetic properties. We demonstrate that layer stacking has a pronounced effect on the diffusion rate at temperatures, where the diffusion is dominated by grain boundaries. We quantify effective diffusion coefficients, which characterize the diffusion rate of Co and Pt through the interface and grain boundaries, providing the possibility to control the homogenization rate of Pt-Co-based heterostructures. The obtained values are in the range of 10-16 – 10-13 cm2/s for temperatures of 150 °C – 350 °C. Heat treatment of thin-film samples results in the coercivity enhancement, which is attributed to short-range chemical ordering effects. We show that introducing an additional Au intermediate layer leads to an increase of the coercive field of the annealed samples due to a modification of exchange coupling between the magnetic grains at the grain boundaries.

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Microstructure and Magnetic Properties of Exchange-Coupled Co72Pt28/Pt/Co81Ir19 Composite Media for Perpendicular Magnetic Recording

Cited by 6 publications

References 38 publications

Homogenization and short-range chemical ordering of Co–Pt alloys driven by the grain boundary migration mechanism

Homogenization and short-range chemical ordering of Co–Pt alloys driven by the grain boundary migration mechanism

Polymer‐/Ceramic‐based Dielectric Composites for Energy Storage and Conversion

Low-temperature diffusion in thin-film Pt-(Au-)-Co heterostructures: a structural and magnetic characterization

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