Magnetic video-pulse action on the nuclear spin echo in multidomain magnetic materials

Akhalkatsi, A. M.; Gegechkori, T. O.; Мамниашвили, Г. И.; Shermadini, Z.; Pogorelyĭ, A. N.; Kuzmak, O.

doi:10.1134/s0031918x08040066

Cited by 6 publications

(5 citation statements)

References 7 publications

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“…The corresponding timing diagrams for the MVP influence for Co and MnSi Co 2 are investigated in work [15] and confirm conclusions of work [13] for magnets where the SPE signals are formed by the distortion mechanism.…”

Section: Introductionsupporting

confidence: 70%

“…In following the theory was developed in a number of works, among which let us note [3][4][5][6][7] ones. It was shown that using the SPE method one could obtain practically the same information on spin-system as by two-pulse echo (TPE) Hahn method.…”

Section: Introductionmentioning

confidence: 99%

“…On the basis of obtained picture of the MVP influence one could make conclusion on the definite duration of transition process regions in the resonant circuit of spectrometer and assume that at decreasing of the PF pulse duration it is possible their overlapping resulting in the simplification of pulse structure, approaching it to rectangular shape when disappeared the edge structure of RF pulse revealing at application of MVP [15]. In this range of RF pulse duration it could take place the change of one SPE formation mechanism on other being characteristic for systems without the observable RF pulse distortion where the SPE signal is absent at resonant excitation as it is the case in lithium ferrite [6].…”

Section: Introductionmentioning

confidence: 99%

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Two-pulse stimulated echo in magnets

Zviadadze

Мамниашвили

Gegechkori

et al. 2012

Phys. Metals Metallogr.

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The results of experimental study of two-pulse stimulated echo in ferromagnets of two types are presented. Ferromagnet Co and half-metal Co MnSi 2, in which a single-pulse echo formed by the distortion mechanism of the fronts of exciting pulse is also observed, are classified among the first type. Lithium ferrite and intermetal compound MnSb characterized by the absence of single-pulse echo in them - belong to the second type. For signals of two-pulse stimulated echo in the materials of the first type a short time and a long time of relaxations are observed. The short time is about the order of value shorter less than the spin-spin relaxation time. The long time is close to the transverse relaxation time of single-pulse echo formed by the distortion mechanism. The mechanisms that provide the possible interpretations of the peculiarities of the processes of nuclear magnetic relaxation are discussed.Comment: 10 pages, 7 figure

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Section: Introductionsupporting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Two-pulse stimulated echo in magnets

Zviadadze

Мамниашвили

Gegechkori

et al. 2012

Phys. Metals Metallogr.

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“…The half metals are regarded as promising materials for spintronics [5]. The NMR spectrometer and MVP excitation technique, as well as the procedures of sample preparations are described in [4,[6][7][8][9].…”

Section: Experimental Results and Their Discussionmentioning

confidence: 99%

Timing and Spectral Diagrams of Magnetic Video-Pulse Excitation Influence on NMR Spin–Echo in Magnets

Мамниашвили

Gegechkori

Akhalkatsi

et al. 2012

J Supercond Nov Magn

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We present the first systematic study of timing and spectral diagrams of magnetic video-pulse influence on the NMR two-pulse echo in a number of magnets (ferromagnets, ferrites, half metals, intermetals). It is shown that the timing diagrams showing the dependence of two-pulse echo intensity on the temporal location of a magnetic video-pulse in respect to radio-frequency pulses and the spectral diagrams of this influence are defined mainly by the local hyperfine field anisotropy and domain walls mobility. These diagrams could be used for the identification of the nature of NMR spectra in multidomain magnetic materials and to improve the resolution capacity of the NMR method in magnets.

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“…1,2 One of these methods involves the use of pulses of a constant magnetic field (the so-called magnetic video pulses (MVPs)), 3,4 which are supplied at different instants of time with respect to the moments of application of exciting radio frequency (RF) pulses. The promising use of MVPs to study the properties of domain walls in ferromagnets has first been demonstrated in Eu garnet Eu 3 Fe 5 O 12 .…”

Section: Introductionmentioning

confidence: 99%

Features of influence of dc magnetic field pulses on a nuclear spin echo in magnets

Мамниашвили¹,

Gegechkori²,

Akhalkatsi

et al. 2012

Low Temperature Physics

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Signal intensities of a two-pulse nuclear spin echo as a function of parameters of dc magnetic field pulses are measured in the series of materials: Li0.5Fe2.5–xZnxO4 (x < 0.25) (enriched in 57Fe isotope to 96.8%), NiMnSb, Co2MnSi, La1–хСахMnO3 (x = 0.2; 0.25) and polycrystalline Co. Two types of dependences of these signals on a supplying time of such pulses with respect to the times of the exciting RF pulses are found. The mechanisms of influence of a domain structure and a dynamic frequency shift on the observed features of the investigated signals are discussed.

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Magnetic video-pulse action on the nuclear spin echo in multidomain magnetic materials

Cited by 6 publications

References 7 publications

Two-pulse stimulated echo in magnets

Two-pulse stimulated echo in magnets

Timing and Spectral Diagrams of Magnetic Video-Pulse Excitation Influence on NMR Spin–Echo in Magnets

Features of influence of dc magnetic field pulses on a nuclear spin echo in magnets

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