Rare-earth-free magnetically hard ferrous materials

Shao, Zefan; Ren, Shenqiang

doi:10.1039/d0na00519c

Cited by 18 publications

(14 citation statements)

References 102 publications

(68 reference statements)

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“…Unlike the common approaches, where the hard magnetic particles (in particular, neodymium–iron–boron (NdFeB) microparticles) are used, we present a new technique with magnetic semihard iron–cobalt (FeCo) nanoparticles, which possess higher saturation magnetization ( M ) and lower coercivity (for details, see the SI Section: Synthesis of Ferromagnetic Nanoparticles). The shape-anisotropic FeCo particles are also considered semihard magnetic materials , with promising properties for fabricating soft robots without the need for high cost, eco-unfriendliness, and toxic rare-based magnetic particles from the robot design. The description of reaction mechanisms and detailed characterization of these particles are summarized in Supporting Information (Section 1: Characterization of the Particles).…”

Section: Resultsmentioning

confidence: 99%

Reprogrammable Soft Swimmers for Minimally Invasive Thrombus Extraction

Pozhitkova

Kladko

Винник

et al. 2022

ACS Appl. Mater. Interfaces

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Thrombosis-related diseases are the primary cause of death in the world. Despite recent advances in thrombosis treatment methods, their invasive nature remains a crucial factor, which leads to considerable deadly consequences. Soft magnetic robots are attracting widespread interest due to their fast response, remote actuation, and shape reprogrammability and can potentially avoid the side effects of conventional approaches. This paper outlines a new approach to the thrombosis treatment via reprogrammable magnetic soft robots that penetrate, hook, and extract the plasma clots in a vein-mimicking system under applied rotating magnetic fields. We present shape-switching bioinspired soft swimmers, capable of locomotion by different mechanisms in vein-mimicking flow conditions and whose swimming efficiency is similar to animals. Further, we demonstrate the potential of a developed robot for minimally invasive thromboextraction with and without fibrinolytic usage, including hooking the plasma clot for 3.1 ± 1.1 min and extracting it from the vein-mimicking system under the applied magnetic fields. We consider an interesting solution for thrombosis treatment to avoid substantial drawbacks of the existing methods.

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Section: Resultsmentioning

confidence: 99%

Reprogrammable Soft Swimmers for Minimally Invasive Thrombus Extraction

Pozhitkova

Kladko

Винник

et al. 2022

ACS Appl. Mater. Interfaces

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“…For example, the size and shape analysis in 3D space could provide accurate data to be used as input in various physical models of magnetism (e.g., the micromagnetic Stoner–Wolfarth or Landau–Lifshitz–Gilbert models [ 12 – 13 ]). In the field of hyperthermia therapies [ 14 – 15 ], involving various types of ferrofluids, or in the development of rare earth-free permanent magnets [ 16 – 17 ], a more complex description of the morphology including particle shape and specific aspect ratio, as the main factors influencing the magnetic anisotropy [ 18 – 19 ] is absolutely necessary.…”

Section: Introductionmentioning

confidence: 99%

A new method for obtaining the magnetic shape anisotropy directly from electron tomography images

Radu¹,

Vlaicu²,

Kuncser³

2022

Beilstein J. Nanotechnol.

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A new methodology to obtain magnetic information on magnetic nanoparticle (MNP) systems via electron tomography techniques is reported in this work. The new methodology is implemented in an under-development software package called Magn3t, written in Python and C++. A novel image-filtering technique that reduces the highly undesired diffraction effects in the tomography tilt-series has been also developed in order to increase the reliability of the correlations between morphology and magnetism. Using the Magn3t software, the magnetic shape anisotropy magnitude and direction of magnetite nanoparticles has been extracted for the first time directly from transmission electron tomography.

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“…FePd alloys with large magnetocrystalline anisotropy have been attracting considerable interest for their potential use in ultrahigh-density magnetic recording storage and high-performance permanent ________ magnets [1,2]. FePd alloys containing about 30 at.…”

Section: Introductionmentioning

confidence: 99%

Effect of Annealing Time on Structural and Magnetic Properties of Fe68Pd32 Nanoparticles Synthesized by Sonoelectrodeposition

Nam¹,

Hoi²,

Trung³

et al. 2022

MaP

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Fe68Pd32 nanoparticles were prepared by sonoelectrodeposition with subsequent annealing at 600 oC for a series of times from 1 h to 6 h. The annealing transformed disordered face-centered cubic (fcc) phase in the as-prepared samples into a multi-phase material containing an ordered L10 FePd, fcc FePd and body-centered cubic (bcc) Fe phases. After annealing at 600°C for 6 h the hard magnetic phase L10-FePd and soft magnetic fcc-FePd phase coexist. The structural and magnetic properties of the samples were studied in dependence of annealing time. The decrease of coercivity with increasing annealing time from 1 h to 4 h is suggested to occur by formation of multi-L10 domain particles, while the increase of coercivity with increasing annealing time from 4 h to 6 h is proposed due to the multiphase nature of the nanoparticles samples.

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Rare-earth-free magnetically hard ferrous materials

Abstract: Permanent magnets, especially rare-earth based magnets, are widely used in energy-critical technologies applied in many modern applications, involving energy conversion and information technologies. However, the environmental impact and strategic supplies...

Cited by 18 publications

References 102 publications

Reprogrammable Soft Swimmers for Minimally Invasive Thrombus Extraction

Reprogrammable Soft Swimmers for Minimally Invasive Thrombus Extraction

A new method for obtaining the magnetic shape anisotropy directly from electron tomography images

Effect of Annealing Time on Structural and Magnetic Properties of Fe68Pd32 Nanoparticles Synthesized by Sonoelectrodeposition

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