The Effect of Electron Flow on Coercivity and Remanence of FePt Nanocomposites Under Heat Treatment

Ashourifar, Hassan; Agah, K. Mikaili; Pour, Ghobad Behzadi; Akbari, Amir; Sebt, S. A.

doi:10.1007/s10948-019-5079-3

Cited by 6 publications

(2 citation statements)

References 17 publications

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“…Studies of nanomagnetism usually explore interesting phenomena in magnetic nanoparticles when compared to its fundamental bulk properties [1]. For example, exotic magnetic states with potential phenomena were reported for frustrated magnetic systems in nanoparticles form and often attributed to finite size effects [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Low-temperature cluster spin glass transition in the single-domain NiCr₂O₄ nanoparticles

Nashaat,

Kassem,

Abu El-Fadl

et al. 2024

Nanotechnology

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NiCr2O4 nanoparticles with average particle size ~15 nm, a single-domain size maintains the bulk canted antiferromagnetic ground state, were synthesized by a microwave combustion method. The magnetic behavior was carefully investigated by static and dynamic magnetic susceptibility measurements. In addition to a spin-glass-like behavior below paramagnetic-ferrimagnetic transition at TC, the NiCr2O4 nanoparticles demonstrate a low-temperature cluster spin glass transition below the spin canting transition TS, which manifests itself as a magnetic anomaly peak around ~12 K (at 100 Oe) in the ZFC magnetization with a relatively stronger field dependence in a 'de Almeida-Thouless' line for spin glasses. The ac susceptibility analyses in different approaches demonstrate a larger relative peak temperature variation per frequency decade of 0.04 and a longer characteristic relaxation time, τ0, in the order of 10-7 sec, against 0.01 and 10-9 sec for the high-temperature blocking, indicating the slow spin dynamics for the low-temperature cluster glassy phase. A field-temperature magnetic phase diagram is proposed for the single-domain NiCr2O4 nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Low-temperature cluster spin glass transition in the single-domain NiCr₂O₄ nanoparticles

Nashaat,

Kassem,

Abu El-Fadl

et al. 2024

Nanotechnology

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“…Therefore, post-thermal treatment is required to recover the tetragonal structure and improve the tetragonality of the c/a ratio as a criterion of the dielectric constant. As a result of annealing, the size of BaTiO 3 particles can increase from a few tens of nanometers to a few hundred nanometers via agglomeration; meanwhile, the explosive growth can be suppressed by appropriate functional groups such as hydroxyl (-OH) and nanotubes [26,27]. In a previous report, the OH group of BaTiO 3 powder was broadly regarded as playing a role in stabilizing the pseudo-cubic structure [28].…”

Section: Introductionmentioning

confidence: 99%

Effects of annealing temperature on structural phase transition and microstructure evolution of hydrothermally synthesized barium titanate nanoparticles

Lee¹,

Jeong²,

Ma³

2022

Mater. Res. Express

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Commercial hydrothermally synthesized BaTiO3 powder with a cubic structure was annealed in a temperature range of 650–900 ℃, and the cubic-tetragonal structure transition and microstructure evolution of the powder were investigated in relation to the annealing process. The BaTiO3 powder used had a cubic structure below an annealing temperature of 800 ℃ and a tetragonal structure above 850 ℃. Particle growth occurred under a low activation energy of ~33.2 kJ/mol because of the nanocrystalline size effect, while the crystallite size slightly decreased in the powder with the cubic structure and sharply increased in that with the tetragonal structure. This was because the OH group in the powder with the cubic structure influenced the lattice extension on the particle surface. This stabilized the cubic structure and reduced the crystal ordering, which retarded the crystallite size. When the annealing temperature was increased, the crystallite growth reduced the intrinsic strain and enhanced the tetragonality in the powder with the tetragonal structure as a result of the removal of the OH group.

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Application of Carbon Nanotubes and Graphene-Based Nanoadsorbents in Water Treatment

Hsu,

Rheima,

Mohammed

et al. 2023

BioNanoSci.

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The Effect of Electron Flow on Coercivity and Remanence of FePt Nanocomposites Under Heat Treatment

Cited by 6 publications

References 17 publications

Low-temperature cluster spin glass transition in the single-domain NiCr₂O₄ nanoparticles

Low-temperature cluster spin glass transition in the single-domain NiCr₂O₄ nanoparticles

Effects of annealing temperature on structural phase transition and microstructure evolution of hydrothermally synthesized barium titanate nanoparticles

Application of Carbon Nanotubes and Graphene-Based Nanoadsorbents in Water Treatment

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The Effect of Electron Flow on Coercivity and Remanence of FePt Nanocomposites Under Heat Treatment

Cited by 6 publications

References 17 publications

Low-temperature cluster spin glass transition in the single-domain NiCr2O4 nanoparticles

Low-temperature cluster spin glass transition in the single-domain NiCr2O4 nanoparticles

Effects of annealing temperature on structural phase transition and microstructure evolution of hydrothermally synthesized barium titanate nanoparticles

Application of Carbon Nanotubes and Graphene-Based Nanoadsorbents in Water Treatment

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Low-temperature cluster spin glass transition in the single-domain NiCr₂O₄ nanoparticles

Low-temperature cluster spin glass transition in the single-domain NiCr₂O₄ nanoparticles