Observation of Nuclear Resonance in a Ferromagnet

Gossard, A. C.; Portis, A. M.

doi:10.1103/physrevlett.3.164

Cited by 162 publications

(53 citation statements)

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“…The observed broadening is attributed to a combination of the hyperfine interaction associated with the interaction between the nuclear spin and its own electron shell, and the local spin/electron distributions. 7 The frequency positions of the fitted bands are in good agreement with the previously reported 59 Co NMR studies by Gossard and Portis, 7 and Sort et al 15 The 59 Co NMR results are summarized in Table I. Based on the spectral fitting, it was found that the untreated Co powder consists of 20Ϯ 3% unfaulted fcc, 52Ϯ 3% unfaulted hcp, 10Ϯ 3% hcp deformation faults, and 19Ϯ 3% fcc deformation faults.…”

Section: Resultssupporting

confidence: 78%

“…Since cobalt is a ferromagnetic metal, conventional 59 Co NMR cannot be applied. Internal field 59 Co NMR of ferromagnetic Co was first observed in 1959 by Gossard and Portis,7 and since then the application of internal-field NMR to ferromagnetic materials has developed considerably. [8][9][10] There has been an extensive subsequent use of 59 Co NMR to characterize the different Co atomic environments ͓fcc, hcp, and sfs͔ in Co metal, [11][12][13][14][15] in Co films, [16][17][18][19] in catalysts, 20,21 and in alloys.…”

Section: Introductionmentioning

confidence: 99%

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C59oNMR study of the allotropic phase transformation in small ferromagnetic cobalt particles

et al. 2009

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To demonstrate the potential of nuclear-magnetic-resonance ͑NMR͒ spectroscopy in investigating detailed structural properties in ferromagnetic materials, the allotropic phase transformation of polycrystalline cobalt with m particle size ͑Ͻ2 m͒ is characterized by internal-field 59 Co NMR. The 59 Co NMR spectra show distinct resonance bands corresponding to the different Co sites: face-centered cubic ͑fcc͒, hexagonal-close packed ͑hcp͒, and stacking faults ͑sfs͒, in Co metal powder. The hcp→ fcc phase-transition temperature is determined by systematically monitoring the signal intensity of each Co environment in a series of heat-treated Co powders. The potential limits to which absolute quantification of the different sites can be pushed are mentioned, with relative changes in intensity giving unequivocal evidence of the structural evolution. For example, the phase-transition temperature is observed to be 500Ϯ 25°C, and above this temperature, the sf Co sites were reduced by more than 10%.

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Section: Resultssupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

C59oNMR study of the allotropic phase transformation in small ferromagnetic cobalt particles

et al. 2009

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“…20 In EuO the magnetic anisotropy is low and consequently the amplification factor for nuclei in domain walls is not substantially stronger than for nuclei in domains. Indeed, the amplification in domains is given by η Domain = |H hf |/|H an + H int |, where H hf is the hyperfine field, H an is the anisotropy field and H int is the internal field defined as the sum of the external field, the demagnetization field and the Lorentz field 21 . The amplification in a domain wall of a spherical particle is given by η DW = πD|H hf |/(N δ|M (T )|), where N is the demagnetization factor of the domain, D is the domain size, δ is the width of the domain wall and M (T ) is the magnetization in domains at temperature T, 22 and therefore:…”

Section: B Remarks On Amplification Factormentioning

confidence: 99%

Magnetic properties of pure and Gd-doped EuO probed by NMR

et al. 2005

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An Eu NMR study in the ferromagnetic phase of pure and Gd doped EuO was performed. A complete description of the NMR lineshape of pure EuO allowed for the influence of doping EuO with Gd impurities to be highlighted. The presence of a temperature dependent static magnetic inhomogeneity in Gd doped EuO was demonstrated by studying the temperature dependence of the lineshapes. The results suggest that the inhomogeneity in 0.6% Gd doped EuO is linked to colossal magnetoresistance. The measurement of the spin-lattice relaxation times as a function of temperature led to the determination of the value of the exchange integral J as a function of Gd doping. It was found that J is temperature independent and spatially homogeneous for all the samples and that its value increases abruptly with increasing Gd doping.

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“…[77,78]. ·ÂÓÂÍÕÇÓÐÞÇ ÑÔÑÃÇÐÐÑÔÕË (à××ÇÍÕ ÖÔËÎÇÐËâ ÄÑÊÃÖÉAEÂáÜÇÅÑ ÒÑÎâ ÒÓË ÒÇÓÇÑÓËÇÐ-ÕÂÙËË ÐÂÏÂÅÐËÚÇÐÐÑÔÕË AEÑÏÇÐÑÄ) ËÏÇÇÕ Á®² Ä ×ÇÓÓÑ-ÏÂÅÐÇÕËÍÂØ [79], ÐÂÃÎáAEÈÐÐÞÌ ÊÐÂÚËÕÇÎßÐÑ ÒÑÊAEÐÇÇ [80].…”

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Magnetic resonance: discovery, investigation and application

Kessenikh¹

2009

Usp. Fiz. Nauk

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Observation of Nuclear Resonance in a Ferromagnet

Cited by 162 publications

References 6 publications

C59oNMR study of the allotropic phase transformation in small ferromagnetic cobalt particles

C59oNMR study of the allotropic phase transformation in small ferromagnetic cobalt particles

Magnetic properties of pure and Gd-doped EuO probed by NMR

Magnetic resonance: discovery, investigation and application

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