Investigation of the pinning and mobility of domain walls in cobalt micro- and nanowires by the nuclear spin echo method under the additional influence of a magnetic video pulse

Gavasheli, Tsisana; Мамниашвили, Г. И.; Shermadini, Z.; Zedginidze, Tinatin; Petriashvili, Tamar; Gegeckori, T.O.; Janjalia, M.V.

doi:10.1016/j.jmmm.2019.166310

Cited by 11 publications

(11 citation statements)

References 12 publications

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“…The channel 5 generates MVP pulses applied to the lower winding of the resonator. A description of the NMR spectrometer and MVP unit is given in (Gavasheli et al, 2020). The experimental results were obtained at T = 77 K. The echo signal amplitude was measured in the presence and absence of a MVP with amplitude H.…”

Section: Experimental Results and Their Discussionmentioning

confidence: 99%

“…The value А m , which is the area of the MVP, is constant for all threshold values of  m , when the TPE intensity begins to decrease due to the tear-off from the pinning centers. We also note that earlier in (Mamniashvili et al, 2015;Pleshakov et al, 2016;Gavasheli et al, 2020) the dependence of Н 0 on the external magnetic field H e was not studied. As is known (Pleshakov et al, 2016), the application of a large constant magnetic field reduces the number of DWs, and the remaining ones are distributed over pinning centers, which contribute to a greater pinning.…”

Section: Introductionmentioning

confidence: 92%

“…In particular, it was shown in (Pleshakov et al, 2016;Gavasheli et al, 2020), that the use of nuclear spin echoes from nuclei in DWs of lithium ferrite and cobalt nanowires in combination with magnetic video-pulse (MVP) is a convenient method for studying the pinning of DWs in these systems. This method is also of a great interest for the study of magnets for applications in information recording devices and sensors.…”

Section: Introductionmentioning

confidence: 99%

“…The methodology of (Mamniashvili et al, 2015;Pleshakov et al, 2016;Gavasheli et al, 2020) is used for the study of the dependence of the pinning force Н 0 in cobalt micropowders on the duration of MVP  m and the magnitude of the external magnetic field Н e . As it known (Mamniashvili et al, 2015), cobalt and lithium-zinc ferrite are very different in their NMR properties: in cobalt, the anisotropy of the hyperfine field (HFF) is an order of magnitude higher than its value for lithium ferrite.…”

Section: Introductionmentioning

confidence: 99%

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NMR Spin Echo Study of Domain Wall Pinning in Magnets in Combination with an Additional Magnetic Video-Pulse

GAVASHELI,

MAMNIASHVILI,

GEGECHKORI

2023

EPSTEM

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NMR spin echo at application of an additional magnetic video-pulse is a convenient method to study the domain wall pinning in magnetic materials. Domain wall (DW) pinning is the critical amplitude of the magnetic video-pulse (MVP) below which the DW is fixed. For its assessment, two alternative NMR methods were chosen. In the first case, the pinning of DW was measured by the action of MVP on a two-pulse echo signal, and in the second one, the pinning was measured at the combined action of MVP and radiofrequency (RF) pulses on the nuclear spin system in DW during the process of formation a single-pulse echo, by means of generation of the so-called magnetic echo signal. DW pinning was studied by these two methods in magnets (lithium-zinc ferrite and cobalt micropowder samples).

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Section: Experimental Results and Their Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

NMR Spin Echo Study of Domain Wall Pinning in Magnets in Combination with an Additional Magnetic Video-Pulse

GAVASHELI,

MAMNIASHVILI,

GEGECHKORI

2023

EPSTEM

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“…In the case of intuitiveness and interest, students can complete their learning tasks more e ectively and improve their self-con dence. [6,7].…”

Section: Introductionmentioning

confidence: 99%

Methods of Improving and Optimizing English Education in Colleges and Universities Assisted by Microvideo Technology

Wang

2022

Scientific Programming

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English teaching in general higher education is faced with great challenges. English teachers have to face a group of students from different regions, who have received different English teaching methods during middle school, and their English proficiency is uneven. At present, the teaching methods of most colleges and universities are backward, unable to make full use of modern information technology, and students have low interest in learning, poor independent learning ability, and low learning effect, especially in English. In order to comprehensively improve students’ English level, English teaching methods in colleges and universities should be completely different from the traditional teaching methods in middle schools. This paper sorts out trial research, questionnaire survey, and data analysis method and combines some problems existing in college English teaching and the characteristics of microvideo, such as short, concise, sound, and text, to apply microvideo as a teaching resource in college English grammar teaching. A trial group was set up to study the effectiveness of microvideo teaching. No students in the trial group disliked the microvideo teaching and the average score of students in the trial group was 8.992 points higher than the average score of students in the traditional group. The results show that microvideo teaching can not only increase students’ interest in learning English but also improve their English language skills.

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Analog of a Single-Pulse Echo Signal in Cobalt Formed by an Additional Magnetic Videopulse

Мамниашвили¹,

Gegechkori²

2021

J Appl Spectrosc

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Investigation of the pinning and mobility of domain walls in cobalt micro- and nanowires by the nuclear spin echo method under the additional influence of a magnetic video pulse

Cited by 11 publications

References 12 publications

NMR Spin Echo Study of Domain Wall Pinning in Magnets in Combination with an Additional Magnetic Video-Pulse

NMR Spin Echo Study of Domain Wall Pinning in Magnets in Combination with an Additional Magnetic Video-Pulse

Methods of Improving and Optimizing English Education in Colleges and Universities Assisted by Microvideo Technology

Analog of a Single-Pulse Echo Signal in Cobalt Formed by an Additional Magnetic Videopulse

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