Relaxation time of superparamagnetic particles with uniaxial symmetry in the presence of an external magnetic field

Hachemi, H.; Hachemi, A.; Louail, L.

doi:10.1016/j.matlet.2003.07.020

Cited by 2 publications

(1 citation statement)

References 15 publications

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“…A direct solution of the LLG equation was discussed for larger magnetic particles, in which several magnetic domains exist [24,38]. Although the set of single-domain particles with random direction of magnetization was investigated [39], the model does not include the dipole interactions between the particles. These models are thus insufficient in a study of single-domain nanoparticle systems with mutual dipolar interaction.…”

Section: Introductionmentioning

confidence: 99%

Electron magnetic resonance in interacting ferromagnetic-metal nanoparticle systems: experiment and numerical simulation

Mitsumata

Tomita

Hagiwara

et al. 2009

J. Phys.: Condens. Matter

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We have studied electron magnetic resonance (EMR) in ferromagnetic-metal nanoparticle systems which show promise as a component of left-handed metamaterials. Metallic Ni nanoparticles of about 8 nm in diameter are embedded in polymer films. When the average distance between the nanoparticles is decreased, we observed that the EMR signal shifts and broadens. Theoretical analyses based on micromagnetics simulation confirm that the shift of the signal is traced back to an increase in the magnetic dipole field in the nanoparticle systems due to the decrease in interparticle distance. Moreover, the simulation reveals that the perpendicular component of the dipolar field causes the broadening of the signal. The present study demonstrates that a dynamic analysis of the magnetization, with an explicit treatment of the magnetic dipole interactions, is necessary for a thorough understanding of the EMR and magnetic permeability of interacting nanoparticle systems.

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Section: Introductionmentioning

confidence: 99%

Electron magnetic resonance in interacting ferromagnetic-metal nanoparticle systems: experiment and numerical simulation

Mitsumata

Tomita

Hagiwara

et al. 2009

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

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Synthesis of soft/hard magnetic FePt-based glassy alloys with supercooled liquid region

Makino

Kazahari

Zhang

et al. 2008

Journal of Applied Physics

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Since the glassy alloys have structural homogeneity on a nanoscopic scale and wide supercooled liquid region, ΔTx (temperature interval between glass transition and crystallization), these materials are recognized as promising micro/nano-materials for nanomachines or micro electro-mechanical systems (MEMS). As one of the micro/nano components, the hard magnetic one is immensely desired. We systematically investigated the effect of metalloids composition in Fe-Pt-metalloids alloys on the glass-forming ability, and developed Fe55Pt25Si16B2P2, Fe55Pt25Si15B3P2 and (Fe0.55Pt0.25Si0.16B0.02P0.02)96Zr4 (at%) glassy alloys with ΔTx of 37 K and 48 K, respectively. With structural change from the glassy phase to a nano-composite structure consisting of L10 FePt phase, the coercivity significantly increases from 15 A/m to 170 kA/m for the former one. There is possibility for making the hard magnetic components by the fabrication in ΔTx followed by annealing for the crystallization of the FePt–based glassy alloys. Considering the high magnetocrystalline anisotropy of the L10 phase, which should lead to room-temperature ferromagnetic stability for component sizes as small as nm-order, these Fe-Pt-based glassy alloys have great potential for fabrication of hard magnetic micro/nano structures.

show abstract

Relaxation time of superparamagnetic particles with uniaxial symmetry in the presence of an external magnetic field

Cited by 2 publications

References 15 publications

Electron magnetic resonance in interacting ferromagnetic-metal nanoparticle systems: experiment and numerical simulation

Electron magnetic resonance in interacting ferromagnetic-metal nanoparticle systems: experiment and numerical simulation

Synthesis of soft/hard magnetic FePt-based glassy alloys with supercooled liquid region

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