Oriented exchange-coupled L1<sub>0</sub>-FePt/Co core-shell nanoparticles with variable Co thickness

Liu, Xin; Zuo, Shulan; Wang, Hui; Zhang, Tianli; Dong, Ying; Jiang, Chengbao

doi:10.1039/d1ra09304e

Cited by 3 publications

(3 citation statements)

References 37 publications

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“…There are real spring-exchange magnets such as sintered powder composites [ 39 , 40 , 41 ], core-shell nanoparticles [ 42 ], and multi-layer systems [ 43 , 44 ] that are known in the literature. In all cases, the expected decrease in coercivity with an increase in soft component was observed.…”

Section: Brief Review Of High and Ultra-high Coercive Magnetic Materialsmentioning

confidence: 99%

“…In all cases, the expected decrease in coercivity with an increase in soft component was observed. However, the spring-exchange mechanism allowed for enhancing the | BH | max parameter by 80% for FePt-Co core-shell nanoparticles [ 42 ], 30% for a SmCo-Co thin layer system [ 44 ], and 25% for a α-FeCo/Pr 2 Fe 14 B nanocomposite [ 39 ]. Moreover, progress has been reported for hard–soft ferrite systems, with the | BH | max reaching a value of nearly 30 kJ/m 3 [ 40 ].…”

Section: Brief Review Of High and Ultra-high Coercive Magnetic Materialsmentioning

confidence: 99%

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High and Ultra-High Coercive Materials in Spring-Exchange Systems—Review, Simulations and Perspective

Chrobak

2022

Materials

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The paper refers to the spring-exchange magnetic systems containing magnetically soft and hard phases. This work consists of two parts. The first part is a brief review of hard magnetic materials, with special attention paid to ultra-high coercive compounds, as well as selected spring-exchange systems. The second part is a theoretical discussion based on the Monte Carlo micromagnetic simulations about the possible enhancement of the hard magnetic properties of systems composed of magnetically soft, as well as high and ultra-high coercive, phases. As shown, the analyzed systems reveal the potential for improving the |BH|max parameter, filling the gap between conventional and Nd-based permanent magnets. Moreover, the carried-out simulations indicate the advantages and limitations of the spring-exchange composites, which could lead to a reduction in rare earth elements in permanent magnet applications.

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Section: Brief Review Of High and Ultra-high Coercive Magnetic Materialsmentioning

confidence: 99%

Section: Brief Review Of High and Ultra-high Coercive Magnetic Materialsmentioning

confidence: 99%

High and Ultra-High Coercive Materials in Spring-Exchange Systems—Review, Simulations and Perspective

Chrobak

2022

Materials

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“…Examples of heterostructures with efficient interface exchange-coupling have mainly been reported in core-shell nanoparticles. [22][23][24] Recently, a strong coupling has also been demonstrated in more complex morphologies such as nanocomposites. [20,[25][26][27][28] Such nano-heterostructures represent a challenge in the elucidation of the interface magnetic interactions.…”

Section: Introductionmentioning

confidence: 99%

Unraveling Exchange Coupling in Ferrites Nano‐Heterostructures

Maltoni,

Barucca,

Rutkowski

et al. 2023

Small

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The magnetic coupling of a set of SrFe12O19/CoFe2O4 nanocomposites is investigated. Advanced electron microscopy evidences the structural coherence and texture at the interfaces of the nanostructures. The fraction of the lower anisotropy phase (CoFe2O4) is tuned to assess the limits that define magnetically exchange‐coupled interfaces by performing magnetic remanence, first‐order reversal curves (FORCs), and relaxation measurements. By combining these magnetometry techniques and the structural and morphological information from X‐ray diffraction, electron microscopy, and Mössbauer spectrometry, the exchange intergranular interaction is evidenced, and the critical thickness within which coupled interfaces have a uniform reversal unraveled.

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Magnetically Guided Theranostics: Novel Nanotubular Magnetic Resonance Imaging Contrast System Using Halloysite Nanotubes Embedded with Iron–Platinum Nanoparticles for Hepatocellular Carcinoma Treatment

Chan,

Lee,

et al. 2024

Small Structures

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Halloysite nanotubes (HNTs) have a layered structure of clay silicate minerals and a tubular shape, which is suitable for the uniform loading of small substrates and drug molecules. The inner diameter of HNTs with an acidic solvent is selectively etched to increase the loading capacity of magnetic iron–platinum (FePt) nanoparticles. The FePt nanoparticles and etched HNTs (eHNT) are then composited by vacuum decompression. The resulting product is named FePt@eHNT and is used as a contrast agent for T2‐weighted magnetic resonance imaging. According to a comprehensive analysis of the material and its magnetic properties, by adding different proportions of HNTs before and after modification, the saturation magnetization can reach 23.769 emu g−1, which is higher than that of the composite materials studied in previous studies. This is because the tubular structure promotes the orderly displacement of the FePt nanoparticles under three‐dimensional space constraints and the uniform effect of the magnetic field. In addition, the magnetothermal effect of the composite material is observed and its potential as an imaging agent is investigated. In this study, the enhancement of its ferromagnetism and its potential to become a multifunctional composite material for applications in drug delivery, magnetic hyperthermia, and bioimaging is demonstrated.

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Oriented exchange-coupled L1₀-FePt/Co core-shell nanoparticles with variable Co thickness

Abstract: With the increase of Co layer thickness, the outer layer Co and the core gradually decoupled.

Cited by 3 publications

References 37 publications

High and Ultra-High Coercive Materials in Spring-Exchange Systems—Review, Simulations and Perspective

High and Ultra-High Coercive Materials in Spring-Exchange Systems—Review, Simulations and Perspective

Unraveling Exchange Coupling in Ferrites Nano‐Heterostructures

Magnetically Guided Theranostics: Novel Nanotubular Magnetic Resonance Imaging Contrast System Using Halloysite Nanotubes Embedded with Iron–Platinum Nanoparticles for Hepatocellular Carcinoma Treatment

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Oriented exchange-coupled L10-FePt/Co core-shell nanoparticles with variable Co thickness

Abstract: With the increase of Co layer thickness, the outer layer Co and the core gradually decoupled.

Cited by 3 publications

References 37 publications

High and Ultra-High Coercive Materials in Spring-Exchange Systems—Review, Simulations and Perspective

High and Ultra-High Coercive Materials in Spring-Exchange Systems—Review, Simulations and Perspective

Unraveling Exchange Coupling in Ferrites Nano‐Heterostructures

Magnetically Guided Theranostics: Novel Nanotubular Magnetic Resonance Imaging Contrast System Using Halloysite Nanotubes Embedded with Iron–Platinum Nanoparticles for Hepatocellular Carcinoma Treatment

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Oriented exchange-coupled L1₀-FePt/Co core-shell nanoparticles with variable Co thickness