Electrical properties and giant magnetoresistance of the CoFeB–SiO2 amorphous granular composites

Kalinin, Yu. E.; Ситников, А. В.; Stognei, O. V.; Золотухин, И. В.; Neretin, P.V.

doi:10.1016/s0921-5093(00)01606-3

Cited by 39 publications

(19 citation statements)

References 8 publications

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“…The invariance of the TMR values may also indicate a low level of defectiveness of the fluoride matrix. In the opposite case the defect concentration should decrease during annealing and as a consequence the TMR values should increase [6] but such result is not observed in our experiment.…”

Section: Resultscontrasting

confidence: 78%

“…However, in this case, the resistance increased to such high values that it did not allow to correctly determine the magnitude of the TMR effect. A possible explanation for this fact is a significant reduction in the degree of defectiveness of the dielectric matrix as a result of annealing at 350 C. It is known that in composites in addition to direct tunneling of electrons between the granules the hopping conductivity along the defects of the dielectric matrix also exists [6]. In our case, such defects are the broken bonds of magnesium atoms and cobalt atoms dissolved in fluoride.…”

Section: Figmentioning

confidence: 83%

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Magnetotransport properties of Co_х(MgF₂)_100-x oxygen-free nanocomposites

et al. 2018

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Abstract. Electric and magnetoresistive properties of Co х (MgF 2 ) 100-х thin films (14 ≤ x, ат. % ≤ 62) were investigated. It is established that the received films have a composite structure. Magnetoresistive and electric properties of the films in initial state and after heat treatment have been investigated. The magnetoresistive effect of the studied samples in initial state reaches 7,5% in magnetic field of 10 kOe. It is established that the composites structure is steady against thermal heating up to 250 °C. The change of composites magnetoresistive effect after heat treatment depends on the Co concentration. The particularities of the magnetoresistive changes after annealing are discussed.

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Section: Resultscontrasting

confidence: 78%

Section: Figmentioning

confidence: 83%

Magnetotransport properties of Co_х(MgF₂)_100-x oxygen-free nanocomposites

et al. 2018

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“…Пленки примерно такого же состава Al 0.75 Si 0.25 были получены в Воронежском техническом университете на аналогичных подложках Si(100) ионно-лучевым напылением при давлении аргона в камере 8.0 · 10 −4 mm Hg, токе плазмы 170 mA и напряжении 3500 V [7]. Далее образцы, полученные ионно-лучевым напылением, подвергались импульсному фотонному от-жигу (ИФО) на установке УОЛП-1М, в которой ис-пользуются ксеноновые лампы с диапазоном длин волн 200−1200 nm.…”

Section: объекты и методы исследованияunclassified

Особенности фазообразования и электронного строения в пленочных композитах Al-=SUB=-1-x-=/SUB=-Si-=SUB=-x-=/SUB=- при магнетронном и ионно-лучевом напылении

Терехов¹,

Usol’tseva²,

Serbin³

et al. 2018

Физика Твердого Тела

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The peculiarities of the phase composition and electronic structure of aluminum–silicon composite films near the Al_0.75Si_0.25 composition obtained by the magnetron and ion-beam sputtering methods on a Si(100) silicon substrate are studied using the X-ray diffraction techniques and ultrasoft X-ray emission spectroscopy. In addition to silicon nanocrystals of about 25 nm in size, an ordered solid solution corresponding to the previously unknown Al_3Si phase is formed in magnetron sputtering on a polycrystalline Al matrix. Films obtained by ion-beam sputtering of the composite target are found to be monophasic and contained only one phase of an ordered solid solution of aluminum silicide Al_3Si of the Pm3m cubic system with the primitive cell parameter a = 4.085 Å. However, subsequent pulsed photon annealing of the composite with different radiation doses from 145 to 216 J/cm^2 gives rise to the partial decomposition of the Al_3Si phase with the formation of free metallic aluminum and silicon nanocrystals with sizes in the range from 50 to 100 nm, depending on the pulsed photon radiation dose.

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“…They present interesting optic and magneto-optic properties [18][19][20][21], high absorption coefficient of electromagnetic radiation within the range of radio and microwave frequency [4,18,22].…”

Section: Introductionmentioning

confidence: 99%

Inductive type properties of FeCoZr–CaF2 and FeCoZr–PZT nanocomposites

Kołtunowicz

2015

J Mater Sci: Mater Electron

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The paper presents investigations into frequency dependences of conductivity, capacitance and the phase angle h for nanocomposites (FeCoZr) x (CaF 2 ) (100-x) and (FeCoZr) x (PZT) (100-x) . The nanocomposites have been produced with the application of ion-beam sputtering using pure argon ions (oxygen-free materials) and mixed ions of argon and oxygen (oxygen materials). The phase angle versus frequency characteristics for the oxygen nanocomposites show a transition from negative to positive phase angle values along with the frequency increase. The maximum observed phase angle h values reach beyond the 90°. The phase angle transition through 0°is accompanied with the voltage resonance phenomenon that is represented by strong minima in the capacitance versus frequency curves. In the conductivity versus frequency characteristics, strong minima occur during the phase angle h transition through 90°, which corresponds to the occurrence of current resonance. Occurrence of the coilless inductance features in nanocomposites (FeCoZr) x (PZT) (100-x) and (FeCoZr) x (CaF 2 ) (100-x) , produced with the ion-beam sputtering using argon and oxygen ions, is related to the formation of a subsurface layer of metal oxides on the metallic phase nanogranules.

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Electrical properties and giant magnetoresistance of the CoFeB–SiO2 amorphous granular composites

Cited by 39 publications

References 8 publications

Magnetotransport properties of Co_х(MgF₂)_100-x oxygen-free nanocomposites

Magnetotransport properties of Co_х(MgF₂)_100-x oxygen-free nanocomposites

Особенности фазообразования и электронного строения в пленочных композитах Al-=SUB=-1-x-=/SUB=-Si-=SUB=-x-=/SUB=- при магнетронном и ионно-лучевом напылении

Inductive type properties of FeCoZr–CaF2 and FeCoZr–PZT nanocomposites

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Electrical properties and giant magnetoresistance of the CoFeB–SiO2 amorphous granular composites

Cited by 39 publications

References 8 publications

Magnetotransport properties of Coх(MgF2)100-x oxygen-free nanocomposites

Magnetotransport properties of Coх(MgF2)100-x oxygen-free nanocomposites

Особенности фазообразования и электронного строения в пленочных композитах Al-=SUB=-1-x-=/SUB=-Si-=SUB=-x-=/SUB=- при магнетронном и ионно-лучевом напылении

Inductive type properties of FeCoZr–CaF2 and FeCoZr–PZT nanocomposites

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Magnetotransport properties of Co_х(MgF₂)_100-x oxygen-free nanocomposites

Magnetotransport properties of Co_х(MgF₂)_100-x oxygen-free nanocomposites