Predicted time dependence of the switching field for magnetic materials

Victora, R. H.

doi:10.1103/physrevlett.63.457

Cited by 310 publications

(175 citation statements)

References 13 publications

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“…This ratio was chosen so that both the remanence and the coercive field ͑H C ͒ in the ideal noninteracting case at very low temperatures reproduce the expected values M R Ϸ 0.50 and H C Ϸ 0.48 H a , 19 where H a =2 K/ M S is the anisotropy field of the particles. Since the H a -value is of primary importance in determining the magnetic properties of particle systems, because it weights the relative importance of the Zeeman energy, 26 in our simulations we emphasize the value of the external field in relation with H a .…”

Section: Modelization and Discussionmentioning

confidence: 99%

Influence of dipolar interactions on hyperthermia properties of ferromagnetic particles

Serantes

Baldomir

Martínez-Boubeta

et al. 2010

Journal of Applied Physics

169

152

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Published by the American Institute of Physics. Related ArticlesFe3O4-citrate-curcumin: Promising conjugates for superoxide scavenging, tumor suppression and cancer hyperthermia J. Appl. Phys. 111, 064702 (2012) Integrated intravital microscopy and mathematical modeling to optimize nanotherapeutics delivery to tumors AIP Advances 2, 011208 (2012) In vitro cytotoxicity of Selol-loaded magnetic nanocapsules against neoplastic cell lines under AC magnetic field activation J. Appl. Phys. 111, 07B335 (2012) Magnetically driven spinning nanowires as effective materials for eradicating living cells J. Appl. Phys. 111, 07B329 (2012) Experimental characterization of electrochemical synthesized Fe nanowires for biomedical applications J. Appl. Phys. 111, 056103 (2012) Additional information on J. Appl. Phys. We show both experimental evidences and Monte Carlo modeling of the effects of interparticle dipolar interactions on the hysteresis losses. Results indicate that an increase in the intensity of dipolar interactions produce a decrease in the magnetic susceptibility and hysteresis losses, thus diminishing the hyperthermia output. These findings may have important clinical implications for cancer treatment.

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Section: Modelization and Discussionmentioning

confidence: 99%

Influence of dipolar interactions on hyperthermia properties of ferromagnetic particles

Serantes

Baldomir

Martínez-Boubeta

et al. 2010

Journal of Applied Physics

169

152

View full text Add to dashboard Cite

show abstract

“…For particles with size larger than the magnetic coherence length, by taking into account the intraparticle interaction including the exchange and the dipolar interactions between different magnetic domains and neglecting the interparticle interaction, the exponent α has been shown theoretically ~ 3/2 by R. H. Victora [17].…”

Section: Anisotropy and Blocking Temperaturementioning

confidence: 99%

Anisotropy and magnetization reversal with chains of submicron-sized Co hollow spheres

et al. 2007

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“…In a more general case for a collection of randomly oriented noninteracting SW particles, α ~ 4/3 is obtained by averaging over the angular dependence [4]. For particles with size larger than the magnetic coherence length, by taking into account the intraparticle interaction between different magnetic domains and neglecting the interparticle interaction, the exponent α has been shown theoretically equal to 3/2 by R. H. Victora [5].…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature-dependent shape anisotropy on coercivity for aligned Stoner-Wohlfarth soft ferromagnets

Chen

2007

Phys. Rev. B

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The temperature variation effect of shape anisotropy on the coercivity, H C (T), for the aligned Stoner-Wohlfarth (SW) soft ferromagnets, such as fcc Ni, fcc Co and bcc Fe, are investigated within the framework of Néel-Brown (N-B) analysis. An extended, by introducing a single dimensionless correction function, the reduced magnetization,, in which τ = T/T C is the reduced temperature, M S (T) is the saturation magnetization, and T C is the Curie temperature. The factor, m(τ), accounts for the temperature-dependent effect of the shape anisotropy. The constants, H 0 and E 0 , are for the switching field at zero temperature and the potential barrier at zero field, respectively. According to this newly derived equation, the blocking temperature 2 above which the properties of superparamagnetism show up is described by the expression, T B = E 0 m 2 (τ Β )/[k B ln(t/t 0 )], with the extra correction factor m 2 (τ Β ). The possible effect on H C (T) and the blocking temperature, T B , attributed to the downshift of T C resulting from the finite size effect has been discussed also.3

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Predicted time dependence of the switching field for magnetic materials

Cited by 310 publications

References 13 publications

Influence of dipolar interactions on hyperthermia properties of ferromagnetic particles

Influence of dipolar interactions on hyperthermia properties of ferromagnetic particles

Anisotropy and magnetization reversal with chains of submicron-sized Co hollow spheres

Effect of temperature-dependent shape anisotropy on coercivity for aligned Stoner-Wohlfarth soft ferromagnets

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