K

Müller, Gerhard; Löffelholz, Josef

doi:10.1007/978-3-663-00090-7_11

Cited by 3 publications

(6 citation statements)

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“…The difference, T m (exp) − T m (calc), found for the HT sample may be due to ferromagnetic inter-particle interactions which have been observed to increase the blocking temperature [17]. Evidence for inter-particle interactions can be deduced from magnetization data at low field (H < 5000 Oe), where the anisotropy has negligible effects on M(H, T ) [23]. In noninteracting-particle models, M(H, T ) should scale with H/T in the absence of interactions.…”

Section: Low-field Magnetizationmentioning

confidence: 95%

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Magnetization and electron paramagnetic resonance of Co clusters embedded in Ag nanoparticles

Sánchez

López‐Quintela

Rivas

et al. 1999

J. Phys.: Condens. Matter

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We report magnetization and electron paramagnetic resonance (EPR) measurements on Co clusters embedded in Ag obtained by an inverse micellar technique. The cluster size (∼10 atoms), the saturation magnetization (M s), and the anisotropy constant were obtained from magnetization measurements at low temperature. In the as-prepared sample we found that M s /M bulk s = 0.44±0.05. Reduction of the sample under a H 2 flux at 373 K leads to an enhancement of the ratio M s /M bulk s to 1.16 ± 0.19-consistent with Co-cluster-beam experiments-and to an anisotropy constant of K = (8.5 ± 6.5) × 10 7 erg cm −3 , much larger than the corresponding bulk value. The EPR clearly shows the effect of dynamic narrowing due to superparamagnetic relaxation. Modelling the EPR spectra, we obtained independently the anisotropy energy value and the volume dispersion.

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Section: Low-field Magnetizationmentioning

confidence: 95%

“…where P (V ) is maximum at V 0 , σ V is the standard deviation of ln(V /V 0 ), and C is a normalization constant. We used the modified Langevin function given by Müller and Thursley [23] for the magnetization:…”

Section: High-field Magnetizationmentioning

confidence: 99%

Magnetization and electron paramagnetic resonance of Co clusters embedded in Ag nanoparticles

Sánchez

López‐Quintela

Rivas

et al. 1999

J. Phys.: Condens. Matter

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“…The magnetic shield consists of three layers of Mumetal, 5 mm in thickness, and an outer soft-iron case of 10 mm thickness. Many years ago, the axial and transversal shielding factors were determined to be 3 10 4 and greater than 10 6 [7], respectively. More recently, the axial shielding factor of the CS2 magnetic shield, of essentially the same dimensions, was also found to be greater than 2 10 4 .…”

Section: Quantization Field (C-field)mentioning

confidence: 99%

“…when the (fictive) atomic spin [6] is rotated by π/2 in each irradiation section of the cavity, the mean velocity of atoms contributing to the resonance signal is related to the linewidth of the central Ramsey fringe by (7) where is the effective drift length of the cavity , for a monokinetic beam [20]. In the case of the CS1, 62.92 Hz, 0.760 m, thus , as defined by (7), is 95.6 m/s. By inserting in (6), is found to be 51 10 -15 .…”

Section: Time Dilation: Relativistic Doppler Effectmentioning

confidence: 99%

Performance of the PTB reconstructed primary clock CS1 and an estimate of its current uncertainty

et al. 1998

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The paper describes the current performance of the primary clock CS1 of the Physikalisch-Technische Bundesanstalt (PTB). The clock employs a thermal atomic beam and magnetic state selection. After major reconstruction during 1995 and 1996, routine clock operation was restarted in May 1997. Results of comparisons with UTC(PTB) and other internationally recognized time scales are presented. An evaluation of the CS1 Type B uncertainty yielded 7 10-15 (1). The CS1 is thus the most accurate atomic clock in continuous operation worldwide .

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“…The first study on the superparamagnetic behaviour of an aligned assembly of uniaxially anisotropic particles was made by West [16]. Further investigations regarding possible configurations encountered in experiment was made by Müller and Thurley [17].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic properties of magneto-anisotropic nanoparticles

Bandyopadhyay

2009

J. Phys.: Condens. Matter

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The purpose of this paper is to study the thermodynamic equilibrium properties of a collection of non-interacting three-dimensional (3D) magnetically anisotropic nanoparticles in the light of classical statistical physics. Pertaining to the angular dependence (α) of the magnetic field with the anisotropy axis, energy landscape plots are obtained which reveal a continuous transition from a double well to a single well for [Formula: see text] and show an asymmetric bistable shape for other values of α. The present analysis is related to the interpretation of equilibrium magnetization and static susceptibility of a nanomagnetic system as a function of external magnetic field, B, and temperature, T. The magnetization and susceptibility confirm the non-Langevin behaviour of magneto-anisotropic monodomain particles. The susceptibility analysis establishes the ferromagnetic-, antiferromagnetic- and paramagnetic-like coupling for various α. This study reveals the essential role of magneto-anisotropic energy in the interpretation of the magnetic behaviour of a collection of non-interacting single-domain nanoparticles.

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K

Cited by 3 publications

References 0 publications

Magnetization and electron paramagnetic resonance of Co clusters embedded in Ag nanoparticles

Magnetization and electron paramagnetic resonance of Co clusters embedded in Ag nanoparticles

Performance of the PTB reconstructed primary clock CS1 and an estimate of its current uncertainty

Thermodynamic properties of magneto-anisotropic nanoparticles

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