Conventional and photothermally modulated ferromagnetic resonance investigations of a Nd2Fe17 powder sample

Neto, A. M. J. C.; Gandra, F. G.; Romano, J.A.; Cortez, Anita Cassoli; Silva, E.C.; Gama, S.; Galembeck, Fernando; Vargas, H.; Nikitov, S. A.

doi:10.1016/0304-8853(93)90862-v

Journal of Magnetism and Magnetic Materials

1993

DOI: 10.1016/0304-8853(93)90862-v

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Conventional and photothermally modulated ferromagnetic resonance investigations of a Nd2Fe17 powder sample

A. M. J. C. Neto

F. G. Gandra

J.A. Romano

et al.

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Cited by 3 publications

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“…The FMR line shape is clearly distorted and nonsymmetrical, which may arise from the sweeping field being insufficient to saturate the sample. 13 Nevertheless, the results indicate that the oriented Co 2 Z ferrite has an FMR linewidth of 736 Oe and 755 Oe under an electric field of zero and 6 kV/cm, respectively. Interestingly, a 6 kV/cm electric field applied across the PMN-PT crystal results in a pronounced shift of FMR field ͑H r ͒ from 840 to 802 Oe.…”

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confidence: 83%

Electronic tuning of magnetic permeability in Co2Z hexaferrite toward high frequency electromagnetic device miniaturization

Chen

Daigle

Fitchorov

et al. 2011

Applied Physics Letters

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The magnetic and magnetostriction properties of Z-type cobalt-doped barium hexaferrite with perpendicular c-axis crystallographic texture are presented. The hexaferrite was utilized as a component in Co 2 Z/lead magnesium niobate-lead titanate multiferroic heterostructures whose tunability of permeability with electric field in terms of ferromagnetic resonance shift was supported by experiments and theoretical calculation. A permeability change of 16% was measured by an induced magnetic field of 38 Oe under the application of 6 kV/cm of electric field. These findings lay the foundation for the application of Z-type hexaferrites in tunable rf and microwave devices valued for sending, receiving, and manipulating electromagnetic signals.

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mentioning

confidence: 83%

Electronic tuning of magnetic permeability in Co2Z hexaferrite toward high frequency electromagnetic device miniaturization

Chen

Daigle

Fitchorov

et al. 2011

Applied Physics Letters

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Effect of magnetic coupling on non-radiative relaxation time of Fe3+ sites on LaAl1−x Fe x O3 pigments

Novatski

Somer

Maranha

et al. 2018

Journal of Applied Physics

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Inorganic pigments of the system LaAl1–xFexO3 were prepared by the Pechini and the Solid State Reaction (SSR) methods. Magnetic interactions and non-radiative relaxation time were analyzed by means of phase-resolved photoacoustic spectroscopy and electron paramagnetic resonance (EPR) techniques. EPR results show a change in the magnetic behavior from paramagnetic (x = 0.2 and 0.4) to antiferromagnetic (x = 1.0), which is believed to be a result of the SSR preparation method. Trends in the optical absorption bands of the Fe3+ are attributed to their electronic transitions, and the increase in the band's intensity at 480 and 550 nm was assigned to the increase in the magnetic coupling between Fe–Fe. The phase-resolved method is capable of distinguishing between the two preparation methods, and it is possible to infer that SSR modifies the magnetic coupling of Fe–Fe with x.

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Photothermally modulated magnetic resonance using a light access microwaves cavity: Influence of skin depth and of photo-injected carriers

Cordeiro

Soffner

Mansanares

et al. 2018

Journal of Applied Physics

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This study reports on the modulation frequency dependence of the photothermally modulated magnetic resonance signal of a set of magnetic samples in the form of foils, layers, and thin films: 50μm Fe and Ni foils; 5μm magnetic layer of γ-Fe2O3 in a cassette tape; and 150nm Co and Permalloy films deposited on glass and Si (111) substrates, besides the naked Si substrate. It is shown, both by analytical calculation and by measurements, that the skin depth of the microwaves deeply influences the signal behavior by selecting the portion of the sample that is probed. Clear differences in the frequency dependence are observed between the metallic Ni and Fe foils and the dielectric γ-Fe2O3 cassette tape. Furthermore, the thermal mismatch between the magnetic films (Co and Permalloy) and substrates (glass and Si) also plays a crucial role, once the modulation of the temperature is strongly dependent on the substrate thermal parameters at low modulation frequencies. The non-resonant signal from the diamagnetic Si is also analyzed. It is produced by the absorption of microwaves by the photo-injected free carriers and presents characteristic behavior in the investigated frequency range.

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Conventional and photothermally modulated ferromagnetic resonance investigations of a Nd2Fe17 powder sample

Cited by 3 publications

References 14 publications

Electronic tuning of magnetic permeability in Co2Z hexaferrite toward high frequency electromagnetic device miniaturization

Electronic tuning of magnetic permeability in Co2Z hexaferrite toward high frequency electromagnetic device miniaturization

Effect of magnetic coupling on non-radiative relaxation time of Fe3+ sites on LaAl1−x Fe x O3 pigments

Photothermally modulated magnetic resonance using a light access microwaves cavity: Influence of skin depth and of photo-injected carriers

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