Giant magnetoresistance in a ferromagnet-polymer system

Лачинов, А. Н.; Воробьева, Н. В.; Lachinov, A. A.

doi:10.1134/s002136400623007x

Cited by 11 publications

(16 citation statements)

References 4 publications

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“…Lachinov and Zolotukhin [381] doped thin films of polyaryldiphenylenephthalide (Figure 38), a nonconju gated polymer, with vapor iodine. Electrical conductivity was found to increase with iodine concentration in a large spectrum of temperatures.…”

Section: Miscellaneous Iodine-polymer Complexesmentioning

confidence: 99%

Molecular iodine/polymer complexes

Moulay

2013

Journal of Polymer Engineering

163

127

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A unique feature of molecular iodine by far, is its ability to bind to polymeric materials. A plethora of natural and synthetic polymers develop complexes when treated with molecular iodine, or with a mixture of mole cular iodine and potassium iodide. Many unexpected findings have been encountered upon complexation of iodine and the polymer skeleton, including the color formation, the polymer morphology changes, the compl exation sites or regions, the biological activity, and the electrical conductivity enhancement of the complexes, with poly iodides (I n¯) , mainly I 3¯ and I 5¯, as the actual binding species. Natural polymers that afford such complexes with iodine species are starch (amylose and amylopectin), chitosan, glycogen, silk, wool, albumin, cellulose, xylan, and natural rubber; iodinestarch being the oldest iodinenatural polymer complex. By contrast, numerous synthetic polymers are prone to make com plexes, including poly(vinyl alcohol) (PVA), poly(vinyl pyrrolidone) (PVP), nylons, poly(Schiff base)s, poly aniline, unsaturated polyhydrocarbons (carbon nano tubes, fullerenes C 60 /C 70 , polyacetylene; iodinePVA being the oldest iodinesynthetic polymer complex.

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Section: Miscellaneous Iodine-polymer Complexesmentioning

confidence: 99%

Molecular iodine/polymer complexes

Moulay

2013

Journal of Polymer Engineering

163

127

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“…Therefore, the effect of giant magnetoresistance in metal-polymer heterostructures [8][9][10] (Fig. 2) stands alone among the variety of effects of increasing magnetoresistance under weak magnetic fields (up to 0.5 T), observed in both organic materials and lowdimensional structures based on them.…”

Section: Introductionmentioning

confidence: 99%

“…However, the reversible transition (switching) metal-dielectric in polymer materials under weak magnetic fields was first demonstrated in [8,9].…”

Section: Introductionmentioning

confidence: 99%

Giant magnetoresistance of strong magnet–polymer heterostructures with a wide band gap

Лачинов

Воробьева

2016

J. Synch. Investig.

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Abstract⎯We present the results of studying the effect of a weak external magnetic field on the conductivity of heterostructures containing a wide-gap polymer layer. A set of experiments is singled out for switching the metal-dielectric conductivity, controlled by a weak magnetic field. Evidence of the reliability and repeatability of key experiments are reviewed, and the effect of possible artifacts on switching of the conductivity in the heterostructures under study is discussed.

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“…Previously, the possibility of switching the conduc tivity in the metal/polymer/metal asymmetric struc ture containing only one ferromagnetic electrode and a layer of a wide band gap polymer material (poly(diphenylenephthalide), PDP) was detected [1]. It was also shown that the conductivity switching by the magnetic field is associated with partial polariza tion over the spin of charges injected from the ferro magnet [2].…”

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confidence: 97%

The role of the wide-band-gap polymer layer for the existence of conductivity switching in the valve structure

Лачинов

Воробьева

2012

Phys. Solid State

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428Previously, the possibility of switching the conduc tivity in the metal/polymer/metal asymmetric struc ture containing only one ferromagnetic electrode and a layer of a wide band gap polymer material (poly(diphenylenephthalide), PDP) was detected [1]. It was also shown that the conductivity switching by the magnetic field is associated with partial polariza tion over the spin of charges injected from the ferro magnet [2]. However, the results of [1, 2] do not allow a conclusion on spin transport within the polymer layer. Experiments on the structure such as a spin valve could answer the question on the possibility of spin transport through a rather thick polymer film. In such a structure, the injecting electrode plays the role of a polarizer; the second ferromagnetic electrode serves as an analyzer of spin polarized current carriers. In this case, a change in the magnetization direction in the electrode analyzer should result in modulation of the current flowing in the structure under study.In this context, the objective of this research is to study the possibility of spin transport occurring through a layer of a wide band gap polymer material in an experimental configuration such as the spin valve.The main difference between the samples studied in this work and those used previously [1] is the replacement of the nonmagnetic copper electrode by the ferromagnetic metal Ni electrode. Thus, in this work, we study the "symmetric" ferromagnet/poly mer/ferromagnet structure unlike the "asymmetric" ferromagnet/polymer/non ferromagnetic metal structure previously considered in [1,2]. The elec trode with a large coercivity in the symmetric structure under consideration was fabricated by depositing a nickel layer on an antiferromagnetic Cr layer [3]. The lower two layer chromium/nickel film grown by sequential deposition of these metals on glass in vac uum was characterized in the initial state by a prefer ential direction and increased magnetic rigidity (Fig. 1a). The upper nickel film was a soft magnetic elec trode and had not a preferential direction in the initial state (Fig. 1b). Polymer was deposited in one layer or in two layers to increase the distance for possible spin transfer. The thickness of these structures was no less than 500 nm and to 1.2 μm, respectively. Measure ments were performed at room temperature, magnetic fields were less than 500 mT.Since abrupt changes in the working cell resistance (six-eight orders of magnitude) in the experimental circuit were possible, a circuit with a current generator was used.The external magnetic field could be oriented par allel or perpendicular to the structure plane. Observa Abstract-The effect of electronic switching of the conductivity by a magnetic field lower than 500 mT has been implemented in the spin valve structure in the "current perpendicular to plane" geometry with a trans port layer of a wide band gap polymer to 1200 nm thick. The problem of spin transfer through the polymer layer has been discussed in the model of ballistic charge transport over nanos...

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Giant magnetoresistance in a ferromagnet-polymer system

Cited by 11 publications

References 4 publications

Molecular iodine/polymer complexes

Molecular iodine/polymer complexes

Giant magnetoresistance of strong magnet–polymer heterostructures with a wide band gap

The role of the wide-band-gap polymer layer for the existence of conductivity switching in the valve structure

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