CoCr Binary Nanocluster Wires:  Enhanced Magnetic Properties of the Co-rich Phase

Lee, G. H.; Huh, Seung Hun; Jeong, Jin Wook; Kim, Sang Hyuck; Choi, Byung Jo; Ri, H.-C.

doi:10.1021/cm0206800

Cited by 6 publications

(1 citation statement)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thermal decomposition has been reported on synthesis of CoCr NWs, whereby decomposition of Co 2 (CO) 8 /Cr(CO) 6 occurred in the presence of a magnetic field. 7 FeCo alloy magnetically aligned linear chains (MALCs) were synthesized for the first time using a specialized reaction formation under the polyol process. One major advantage of performing wet-chemical solvothermal routes, such as the polyol process used in this work, is that the materials are produced in a free powder form after cleaning.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of FeCo alloy magnetically aligned linear chains by the polyol process: structural and magnetic characterization

Clifford

Castano

et al. 2015

J. Mater. Chem. C

View full text Add to dashboard Cite

a FeCo alloy magnetically aligned linear chains (MALCs) were synthesized by the polyol process using a unique reaction format departing from conventional bench-top reactions. FeCo MALC morphology was obtained in the presence of an external dynamic magnetic field. XRD analysis confirmed body-centered cubic (bcc) FeCo alloy. Transverse and tangential to incident X-ray path XRD analyses of as-synthesized FeCo MALCs were performed further substantiating the linear chain morphology. Average chain diameter was at ≈ 206 ± 52 nm while Scherrer analysis of (110) gave an average crystallite size of 29 nm. Chemical attachment of each aligned FeCo alloy segment was confirmed by tangential cross-sectioning by focused ion beam (FIB).

show abstract

Section: Introductionmentioning

confidence: 99%

Synthesis of FeCo alloy magnetically aligned linear chains by the polyol process: structural and magnetic characterization

Clifford

Castano

et al. 2015

J. Mater. Chem. C

View full text Add to dashboard Cite

show abstract

Magnetic‐Field‐Directed Growth of CoPt₃ Nanocrystal Microwires

Beecher¹,

Shevchenko

Weller

et al. 2005

Advanced Materials

View full text Add to dashboard Cite

In conclusion, we have shown that it is possible to switch, in a ferroelectric fashion, racemic modifications of materials that possess bulky terminal units. [18] We propose a model in which such materials have weakened interlayer interactions, so that the torque involved in the switching procedure is reduced. This phenomenon is of interest in device applications because the materials do not need the pitch compensation required for chiral materials. Chemically synthesized nanocrystals are the subject of increasingly active research interest, since these materials can behave as ªartificial atomsº or quantum dots that exhibit sizedependent electronic, electrochemical, and optical properties, [1±3] and also on account of their unique self-assembly properties that enable formation of two-dimensional (2D) and three-dimensional (3D) superlattices. [4][5][6][7][8][9] These offer the promise of artificial-atom solids with tunable optical and electronic functionalities. Reports to date on the behavior of 2D and 3D metal-nanocrystal arrays have revealed effects such as single-electron charging, spin-dependent transport, and insulator-to-metal transitions.[10±14] Concerning demonstration of 1D nanocrystal structures, nanocrystal-based wires have been formed using a variety of methods: lateral patterning by electron-beam exposure, [15,16] spontaneous assembly using solution methods, [17±19] self-assembly onto DNA and microtubule biotemplates, [20±23] and self-organization under applied electric [24,25] and magnetic fields. [26±29] In this communication, we report the development of a new route to growth of 1D nanocrystal structures based on the use of an external magnetic field to direct the destabilization and anisotropic aggregation of CoPt 3 -nanocrystal dispersions. Structural and electrical characterization of these novel nanocrystal wires is also presented. 6.8 nm diameter CoPt 3 nanocrystals were synthesized via the simultaneous thermal decomposition of cobalt carbonyl and reduction of platinum acetylacetonate by a long-chain 1,2-diol, and were stabilized by 1-adamantanecarboxylic acid and hexadecylamine capping ligands. [7] As-synthesized nanocrystals oxidized very slowly (they are air-stable for periods of months), and were monodisperse (standard deviation r = 7 %), uniformly spherical, and highly crystalline, possessing a chemically disordered face-centered cubic (fcc) structure. Micrometer-scale 3D colloidal crystals are known to form through slow diffusion of a non-solvent (methanol) into a solution of CoPt 3 nanocrystals in toluene.

show abstract

Ferromagnetic–Antiferromagnetic Coupling in Gas‐Phase Synthesized M(Fe, Co, and Ni)–Cr Nanoparticles for Next‐Generation Magnetic Applications

Bohra,

Giaremis,

et al. 2024

Advanced Science

View full text Add to dashboard Cite

Combining ferromagnetic–antiferromagnetic materials in nanoalloys (i.e., nanoparticles, NPs, containing more than one element) can create a diverse landscape of potential electronic structures. As a result, a number of their magnetic properties can be manipulated, such as the exchange bias between NP core and shell, the Curie temperature of nanoparticulated samples, or their magnetocaloric effect. In this work, such a family of materials (namely M–Cr NPs where M is Fe, Co, Ni, or some combination of them) is reviewed with respect to the tunability of their magnetic properties via optimized doping with Cr up to its solubility limit. To this end, gas‐phase synthesis has proven a most effective method, allowing excellent control over the physical structure, composition, and chemical ordering of fabricated NPs by appropriately selecting various deposition parameters. Recent advances in this field (both experimental and computational) are distilled to provide a better understanding of the underlying physical laws and point toward new directions for cutting‐edge technological applications. For each property, a relevant potential application is associated, such as memory cells and recording heads, induced hyperthermia treatment, and magnetic cooling, respectively, aspiring to help connect the output of fundamental and applied research with current real‐world challenges.

show abstract

CoCr Binary Nanocluster Wires: Enhanced Magnetic Properties of the Co-rich Phase

Cited by 6 publications

References 40 publications

Synthesis of FeCo alloy magnetically aligned linear chains by the polyol process: structural and magnetic characterization

Synthesis of FeCo alloy magnetically aligned linear chains by the polyol process: structural and magnetic characterization

Magnetic‐Field‐Directed Growth of CoPt₃ Nanocrystal Microwires

Ferromagnetic–Antiferromagnetic Coupling in Gas‐Phase Synthesized M(Fe, Co, and Ni)–Cr Nanoparticles for Next‐Generation Magnetic Applications

Contact Info

Product

Resources

About

CoCr Binary Nanocluster Wires: Enhanced Magnetic Properties of the Co-rich Phase

Cited by 6 publications

References 40 publications

Synthesis of FeCo alloy magnetically aligned linear chains by the polyol process: structural and magnetic characterization

Synthesis of FeCo alloy magnetically aligned linear chains by the polyol process: structural and magnetic characterization

Magnetic‐Field‐Directed Growth of CoPt3 Nanocrystal Microwires

Ferromagnetic–Antiferromagnetic Coupling in Gas‐Phase Synthesized M(Fe, Co, and Ni)–Cr Nanoparticles for Next‐Generation Magnetic Applications

Contact Info

Product

Resources

About

Magnetic‐Field‐Directed Growth of CoPt₃ Nanocrystal Microwires