scholarly journals An air-cooled Litz wire coil for measuring the high frequency hysteresis loops of magnetic samples—A useful setup for magnetic hyperthermia applications

2014 ◽  
Vol 85 (9) ◽  
pp. 093904 ◽  
Author(s):  
V. Connord ◽  
B. Mehdaoui ◽  
R. P. Tan ◽  
J. Carrey ◽  
M. Respaud
Keyword(s):  
High Frequency ◽  
Hysteresis Loops ◽  
Magnetic Hyperthermia ◽  
Wire Coil

scholarly journals Probing dynamics of nanoparticle chains formation during magnetic hyperthermia using time-dependent high-frequency hysteresis loops

2021 ◽  
Vol 119 (2) ◽  
pp. 022407
Author(s):  
N. Mille ◽  
D. De Masi ◽  
S. Faure ◽  
J. M. Asensio ◽  
B. Chaudret ◽  
...  
Keyword(s):  
High Frequency ◽  
Hysteresis Loops ◽  
Magnetic Hyperthermia ◽  
Time Dependent ◽  
Nanoparticle Chains

scholarly journals Exploring the potential of the dynamic hysteresis loops via high field, high frequency and temperature adjustable AC magnetometer for magnetic hyperthermia characterization

2020 ◽  
Vol 37 (1) ◽  
pp. 976-991
Author(s):  
Irati Rodrigo ◽  
Idoia Castellanos-Rubio ◽  
Eneko Garaio ◽  
Oihane K. Arriortua ◽  
Maite Insausti ◽  
...  
Keyword(s):  
High Frequency ◽  
High Field ◽  
Hysteresis Loops ◽  
Magnetic Hyperthermia ◽  
Dynamic Hysteresis

scholarly journals High Frequency Hysteresis Losses on γ-Fe2O3 and Fe3O4: Susceptibility as a Magnetic Stamp for Chain Formation

Nanomaterials ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 970 ◽  
Author(s):  
Irene Morales ◽  
Rocio Costo ◽  
Nicolas Mille ◽  
Gustavo da Silva ◽  
Julian Carrey ◽  
...  
Keyword(s):  
High Frequency ◽  
Specific Absorption Rate ◽  
Hysteresis Loops ◽  
Anisotropy Field ◽  
Spatial Arrangement ◽  
Hysteresis Losses ◽  
Heating Efficiency ◽  
Field Independent ◽  
Large Particles ◽  
Chain Ordering

In order to understand the properties involved in the heating performance of magnetic nanoparticles during hyperthermia treatments, a systematic study of different γ-Fe2O3 and Fe3O4 nanoparticles has been done. High-frequency hysteresis loops at 50 kHz carried out on particles with sizes ranging from 6 to 350 nm show susceptibility χ increases from 9 to 40 for large particles and it is almost field independent for the smaller ones. This suggests that the applied field induces chain ordering in large particles but not in the smaller ones due to the competition between thermal and dipolar energy. The specific absorption rate (SAR) calculated from hysteresis losses at 60 mT and 50 kHz ranges from 30 to 360 W/gFe, depending on particle size, and the highest values correspond to particles ordered in chains. This enhanced heating efficiency is not a consequence of the intrinsic properties like saturation magnetization or anisotropy field but to the spatial arrangement of the particles.

scholarly journals Magnetic Properties of Manganese-Zinc Soft Ferrite Ceramic for High Frequency Applications

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3173
Author(s):  
Lucian-Gabriel Petrescu ◽  
Maria-Cătălina Petrescu ◽  
Valentin Ioniță ◽  
Emil Cazacu ◽  
Cătălin-Daniel Constantinescu
Keyword(s):  
Magnetic Properties ◽  
High Frequency ◽  
High Efficiency ◽  
Magnetic Circuit ◽  
Hysteresis Loops ◽  
Vibrating Sample Magnetometer ◽  
Soft Magnetic ◽  
Mnzn Ferrite ◽  
Manganese Zinc ◽  
Soft Ferrite

A soft magnetic MnZn-type ferrite is considered for high frequency applications. First, the morphological, structural, and chemical composition of the material are presented and discussed. Subsequently, by using a vibrating sample magnetometer (VSM), the hysteresis loops are recorded. The open magnetic circuit measurements are corrected by employing demagnetization factors, and by taking into consideration the local magnetic susceptibility. Finally, the hysteresis losses are estimated by the Steinmetz approach, and the results are compared with available commercial information provided by selected MnZn ferrite manufacturers. Such materials are representative in planar inductor and transformer cores due to their typically low losses at high frequency, i.e., up to several MHz, in low-to-medium power applications and providing high efficiency of up to 97%–99%.

scholarly journals Influence on cell death of high frequency motion of magnetic nanoparticles during magnetic hyperthermia experiments

2016 ◽  
Vol 109 (3) ◽  
pp. 032402 ◽  
Author(s):  
N. Hallali ◽  
P. Clerc ◽  
D. Fourmy ◽  
V. Gigoux ◽  
J. Carrey
Keyword(s):  
Cell Death ◽  
Magnetic Nanoparticles ◽  
High Frequency ◽  
Magnetic Hyperthermia

Single Crystal High Frequency Cavity-based EPR Spectroscopy of Single Molecule Magnets

2002 ◽  
Vol 746 ◽  
Author(s):  
S. Hill ◽  
R. S. Edwards ◽  
S. I. Jones ◽  
S. Maccagnano ◽  
J. M. North ◽  
...  
Keyword(s):  
Single Crystal ◽  
Single Molecule ◽  
High Frequency ◽  
Quantum Tunneling ◽  
Perturbation Technique ◽  
Hysteresis Loops ◽  
Direct Determination ◽  
High Sensitivity ◽  
Field Orientation ◽  
Effective Spin

ABSTRACTWe report high frequency electron paramagnetic resonance (EPR) investigations of a series of high spin (total spin up to S = 10) manganese and nickel complexes which have been shown to exhibit single molecule magnetism, including low temperature (below ∼ 1K) hysteresis loops and resonant magnetic quantum tunneling. A cavity perturbation technique enables high sensitivity oriented single crystal EPR measurements spanning a very wide frequency range (16 to 200+ GHz). Fitting of the frequency and field orientation dependence of EPR spectra allows direct determination of the effective spin Hamiltonian parameters. Studies on a range of materials with varying (approximately axial) site symmetries facilitates an assessment of the role of transverse anisotropy (terms in the Hamiltonian that do not commute with ŝz) in the magnetic quantum tunneling phenomenon.

Infrared Absorptive and Dispersive Optical Bistabilities of Semiconductor Superlattice Etalons

1997 ◽  
Vol 06 (01) ◽  
pp. 55-68
Author(s):  
Guo-Zhong Zhao ◽  
Shao-Hua Pan
Keyword(s):  
High Frequency ◽  
Hysteresis Loops ◽  
Infrared Region ◽  
Input Power ◽  
Optical Nonlinearities ◽  
Intersubband Transition ◽  
Level System ◽  
Bloch Equations ◽  
Semiconductor Superlattice ◽  
Analytical Expressions

We have derived Maxwell-Bloch equations of a two-subband model suitable for studying intersubband-transition induced optical-nonlinearities of semiconductor superlattices (SLs). Analytical expressions and numerical illustrations for absorptive and dispersive optical bistabilities (OBs) of SL etalons are given. Both OBs can be realized in infrared region with high frequency selectivity, and their bistable domains and hysteresis loops are much larger than those of a two-level system. The dispersive OB is preferable due to its lower value of the input power.

scholarly journals Dielectric Relaxation Behavior of BTO/LSMO Heterojunction

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1109
Author(s):  
Guoqiang Song ◽  
Yuanyuan Zhang ◽  
Sheng Li ◽  
Jing Yang ◽  
Wei Bai ◽  
...  
Keyword(s):  
Dielectric Relaxation ◽  
High Frequency ◽  
Ferroelectric Properties ◽  
Sol Gel ◽  
Composite Films ◽  
Hysteresis Loops ◽  
Frequency Range ◽  
Magnetoelectric Composite ◽  
Polarization Switch

The BaTiO3 (BTO)/La0.7Sr0.3MnO3 (LSMO) magnetoelectric composite films were prepared by sol-gel method on STO (001) substrates. The heterojunction has highly preferred orientation and exhibits well ferroelectric properties with perfect hysteresis loops and microscopic polarization switch behaviors. The most interesting thing is the abnormal dielectric relaxation phenomenon in the dielectric spectra at high frequency range and around the phase transition temperature of LSMO. By analyzing the resistance properties of LSMO films, it is indicated that charge-based interfacial coupling, Maxwell-Wagner effect due to the JT polaron and fast resistivity rise in LSMO layer is the main reason. This work emphasizes the crucial role of resistivity exchanges and of carrier accumulation at interfaces for the application of magnetoelectric heterojunction.

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