Broadband ferromagnetic resonance spectroscopy of permalloy triangular nanorings

2012 ◽  
Vol 100 (6) ◽  
pp. 062401 ◽  
Author(s):  
J. Ding ◽  
M. Kostylev ◽  
A. O. Adeyeye
Keyword(s):  
Ferromagnetic Resonance ◽  
Resonance Spectroscopy

scholarly journals S-band ferromagnetic resonance spectroscopy and the detection of magnetofossils

2013 ◽  
Vol 10 (80) ◽  
pp. 20120790 ◽  
Author(s):  
Andreas U. Gehring ◽  
Jessica Kind ◽  
Michalis Charilaou ◽  
Inés García-Rubio
Keyword(s):  
Ferromagnetic Resonance ◽  
Uniaxial Anisotropy ◽  
Magnetotactic Bacteria ◽  
Time Frame ◽  
Resonance Spectroscopy ◽  
Verwey Transition ◽  
Geological Time ◽  
Change Of Direction ◽  
X Band ◽  
Magnetite Particles

We report the use of S-band ferromagnetic resonance (FMR) spectroscopy to compare the anisotropic properties of magnetite particles in chains of cultured intact magnetotactic bacteria (MTB) between 300 and 15 K with those of sediment samples of Holocene age in order to infer the presence of magnetofossils and their preservation in a geological time frame. The spectrum of intact MTB at 300 K exhibits distinct uniaxial anisotropy because of the chain alignment of the cellular magnetite particles and their easy axes. This anisotropy becomes less pronounced upon cooling and below the Verwey transition ( T V ) it is nearly vanished mainly owing to the change of direction of the easy axes. In a natural sample, magnetofossils were detected by uniaxial anisotropy traits similar to those obtained from cultured MTB above T V . Our comparative study emphasizes that indispensable information can be obtained from S-band FMR spectra, which offers even a better resolution than X-band FMR for discovering magnetofossils, and this in turn can contribute towards strengthening our relatively sparse database for deciphering the microbial ecology during the Earth's history.

scholarly journals Ferromagnetic Resonance Spectroscopy and Rock Magnetic Characterization of Fossil Coral Skeletons in Ishigaki Islands, Japan

Geosciences ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 400
Author(s):  
Yuho Kumagai ◽  
Norihiro Nakamura ◽  
Tetsuro Sato ◽  
Toshitaka Oka ◽  
Hirokuni Oda
Keyword(s):  
Ferromagnetic Resonance ◽  
Single Domain ◽  
Coral Skeleton ◽  
Resonance Spectroscopy ◽  
Continuous Growth ◽  
Coral Skeletons ◽  
Ishigaki Island ◽  
Biogenic Magnetite ◽  
A Chain ◽  
Fossil Coral

Skeletons of hermatypic corals (e.g., Porites) might have enormous potential as a high-resolution paleomagnetic recorder owing to their rapid and continuous growth over hundreds of years at a rate of up to 2 cm/year, although typical corals show an extremely weak intensity of remanence and low stability. We found that coral tsunami boulders with negligible amounts of calcite on Ishigaki Island show a measurable intensity of remanence; thus, we attempted to characterize the magnetic assemblages in this coral skeleton to determine whether it is of biogenic or detrital magnetite using first-order reversal curve (FORC) measurements, ferromagnetic resonance (FMR) spectroscopy, and petrological observations through field-emission type scanning electron microscope (FE-SEM) with an acid treatment. The FMR derivative spectra of coral skeleton samples represent multiple derivative maxima and extended low-field absorption, indicating the presence of intact biogenic magnetite chains. FORC diagrams represent a “central ridge” signature with a vertical spread. These FMR and FORC features indicate the magnetization of these coral skeletons that are mainly created using intact biogenic magnetites and mixtures of grains from collapsed biogenic magnetites, pseudo-single domain grains, and multi-domain grains such as detrital magnetite. FE-SEM observations confirm the presence of a chain-like structure of iron oxides corresponding to the features of biogenic magnetite. Therefore, the magnetic mineral assemblage in coralline boulders from Ishigaki Island consists of dominant biogenic-origin single-domain magnetite and a trace amount of detrital component, indicating that fossil coral skeletons in Ishigaki Island have potential for utilization in paleomagnetic studies.

Publisher's Note: Ferromagnetic resonance spectroscopy of parametric magnons excited by a four-wave process [Phys. Rev. B75, 140405(R) (2007)]

2007 ◽  
Vol 75 (18) ◽  
Author(s):  
V. V. Naletov ◽  
G. de Loubens ◽  
V. Charbois ◽  
O. Klein ◽  
V. S. Tiberkevich ◽  
...  
Keyword(s):  
Ferromagnetic Resonance ◽  
Wave Process ◽  
Resonance Spectroscopy

Study of fully epitaxial Fe/Pt bilayers for spin pumping by ferromagnetic resonance spectroscopy

2016 ◽  
Vol 93 (13) ◽  
Author(s):  
A. Conca ◽  
S. Keller ◽  
L. Mihalceanu ◽  
T. Kehagias ◽  
G. P. Dimitrakopulos ◽  
...  
Keyword(s):  
Ferromagnetic Resonance ◽  
Resonance Spectroscopy ◽  
Spin Pumping

scholarly journals Broadband strip-line ferromagnetic resonance spectroscopy of soft magnetic CoFeTaZr patterned thin films

AIP Advances ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 056125 ◽  
Author(s):  
S. Gupta ◽  
D. Kumar ◽  
T. L. Jin ◽  
R. Nongjai ◽  
K. Asokan ◽  
...  
Keyword(s):  
Thin Films ◽  
Ferromagnetic Resonance ◽  
Resonance Spectroscopy ◽  
Strip Line ◽  
Soft Magnetic
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