Anisotropic magnetoconductance in polymer thin films

Cox, M Matthijs; Zhu, Feng; Veerhoek, J M; Koopmans, B.

doi:10.1103/physrevb.89.195204

Cited by 10 publications

(16 citation statements)

References 39 publications

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“…These two orientations result in distinctly different responses. For a parallel orientation we find a monotonously increasing MC, which is generally found in the literature for standard OLED devices [1,2,4,22]. This corresponds to the case where all domains are magnetized in plane, minimizing the fringe fields.…”

Section: Fringe-field Magnetoresistancesupporting

confidence: 49%

“…Note that the relative MC will not completely approach zero at large d because of a small intrinsic angle dependence with a δMC on the order of 1% [22]. In the next section, we will show that the gradients in the fringe fields are also expected to follow a similar dependence as a function of the distance away from the magnetic layer.…”

Section: Fringe-field Magnetoresistancementioning

confidence: 96%

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ΔBmechanism for fringe-field organic magnetoresistance

et al. 2015

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Fringe fields emanating from magnetic domain structures can give rise to magnetoresistance in organic semiconductors. In this article, we explain these magnetic-field effects in terms of a B mechanism. This mechanism describes how variations in magnetic-field strength between two polaron hopping sites can induce a difference in precessional motion of the polaron spins, leading to mixing of their spin states. In order to experimentally explore the fringe-field effects, polymer thin-film devices on top of a rough in-plane magnetized cobalt layer are investigated. The cobalt layer can be described by a distribution of out-of-plane magnetic anisotropies, most likely induced by thickness variations in the cobalt. With a magnetic field perpendicular to the cobalt layer, fringe fields are created because some domains are magnetized out of plane whereas the magnetization of other domains remains approximately in plane. By varying the distance between the polymer layer and the cobalt layer, we find that the magnetoresistance arising from these fringe fields reduces with the gradient in the fringe fields, in agreement with the B mechanism.

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Section: Fringe-field Magnetoresistancesupporting

confidence: 49%

Section: Fringe-field Magnetoresistancementioning

confidence: 96%

ΔBmechanism for fringe-field organic magnetoresistance

et al. 2015

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“…Also, the MFEs may occur via particular magneto-responsive species. Indeed, many species, such as an e-h pair ( polaron pair), 3,4,6,[8][9][10][11][12][13][14][15] a triplet exciton (TE), [16][17][18] a trap carrier, and a doubly-charged spinless bipolaron, [19][20][21] have been considered as the main species of MFEs. Due to such many factors to be considered, multiple mechanisms and explanations on MFEs have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Correlation between bias-dependent ESR signals and magnetic field effects in organic light emitting diodes

Kanemoto

Hatanaka

Suzuki

2019

Journal of Applied Physics

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The bias dependent behaviors in magnetic field effects (MFEs) of the current and the electroluminescence (EL) intensity in organic light emitting diodes (OLEDs) have been investigated from electrically-detected and EL-detected magnetic resonance (EDMR and ELDMR) techniques. An EDMR signal was not detected from the electron-only device, and the hole-only device gave only a much smaller EDMR signal than the OLED device. Both the EDMR and ELDMR signals observed from the OLED are concluded to primarily arise from the spin-dependent reaction of electron-hole (e-h) pairs. Both the normalized EDMR and ELDMR signal intensities decrease by increasing the operation bias of OLED, because the increased bias enhances the dissociation and recombination of e-h pairs beyond the increase in the pair-density by the bias. The bias-dependence curves of magneto-conductances and magneto-EL intensities are demonstrated to be very similar to those of the normalized EDMR and ELDMR, respectively. This similarity gives direct evidence that e-h pairs determine the MFEs of the present OLEDs at room temperature and that the MFEs are reduced by bias-dependent dissociation and recombination of e-h pairs. The bias-dependent EDMR and ELDMR experiments are thus effective as probing methods to examine the magnetic field properties via e-h pairs of OLEDs.

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“…Efek ini mengacu pada magneto-conductance (MC) atau organic magneto-resistance (OMAR) [3]. Efek medan magnet dapat muncul pada temperatur ruang dengan kisaran medan magnet kecil yaitu kisaran mili Tesla, membuka potensi aplikasi sensor [4].Pada makalah ini, kajian mengenai efek medan magnet terhadap pembawa muatan lapisan klorofil alam didikusikan. Lapisan klorofil alam ditumbuhkan di atas substrat Cu PCB berpola.…”

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Pengaruh Medan Magnet pada Pembawa Muatan Lapisan Klorofil Spirulina sp Hasil Spin Coating

Nisa

Utari

Purnama

2016

JFA

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IntisariPengaruh medan magnet pada pembawa muatan lapisan Spirulina sp hasil spin coating melalui pengukuran I-V dilaporkan pada makalah ini. Hasil pengukuran magneto konduktansi menunjukkan bahwa medan yang diperlukan untuk mencapai nilai arus terukur konstan pada sampel B lebih kecil dari sampel A. Hal ini mengindikasikan bahwa mekanisme rekombinasi pasangan pembawa muatan disumbang oleh tingkat kemurnian. Akhirnya rasio MC 37,4% dan 50,6% diperoleh untuk masing-masing sampel A dan sampel B. AbstractThe magnetic field effect on the charge carrier of Spirulina sp thin filmsby spin coating fabrication by mean a I-V measurements is reported in this paper. Magnetoconductance measurements showed that the field required to achieve the saturated currentof sample B is smaller than the sample A. This indicated the mechanism of charge carrier recombination attribute to the degree of purity. Finally, a MC ratio of 37.4% and 50.6% was obtained for sample A and sample B, respectively.KATA KUNCI: Spirulinasp, pengukuran I-V, magnetoconductance I. PENDAHULUANDiskusi berkenaan dengan devais elektronika organik belakangan ini menjadi perbincangan hangat para fisikawan. Hal ini mengingat, dewasa ini aplikasi di bidang elektronika modern dibuat tidak hanya disumbang oleh semikonduktor konvensional berbasis bahan semikonduktor, melainkan juga dari bahan organik [1]. Terdapat ketertarikan besar pada bahan organik ini karena biaya yang murah dan mudah dalam proses pembuatan [2]. Salah satu topik hangat di bidang elektonika organic adalah efek medan magnet terhadap pembawa muatan. Telah ditemukan bahwa arus pada devais organik dapat diubah dengan cara mengaplikasikan medan magnet kecil. Efek ini mengacu pada magneto-conductance (MC) atau organic magneto-resistance (OMAR) [3]. Efek medan magnet dapat muncul pada temperatur ruang dengan kisaran medan magnet kecil yaitu kisaran mili Tesla, membuka potensi aplikasi sensor [4].Pada makalah ini, kajian mengenai efek medan magnet terhadap pembawa muatan lapisan klorofil alam didikusikan. Lapisan klorofil alam ditumbuhkan di atas substrat Cu PCB berpola. Evaluasi ketergantungan pembawa muatan terhadap medan magnet pada sampel lapisan klorofil diuji dengan dengan metode I-V sistem two probe pada temperatur ruang. * E-MAIL: bpurnama@mipa.uns.ac.id II. METODOLOGITahapan yang dilakukan untuk membuat larutan Spirulina sp yaitu ekstraksi, evaporasi dan kromatografi mengikuti prosedur sebelumnya [5]. Pada tahap ekstraksi, dilakukan pelarutan serbuk Spirulina sp dengan aceton (p.a.). Untuk 1 gram bubuk Spirulina sp dilarutkan dengan 5 mL aceton. Proses pencampuran dilakukan dengan pengadukan menggunakan magnetic stirrer dengan kecepatan putar 500 rpm selama 60 menit agar diperoleh larutan yang homogen. Selanjutnya dilakukan penyaringan untuk memperoleh batas maksimum ukuran partikel yang diinginkan dengan menggunakan kertas saring Whattman no. 42 (batas maksimum ukuran 2 µm lolos kertas saring). Tahap berikutnya adalah proses evaporasi untuk memisahkan pelarut (aseton) dengan zat terlarut (klorofil...

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Anisotropic magnetoconductance in polymer thin films

Cited by 10 publications

References 39 publications

ΔBmechanism for fringe-field organic magnetoresistance

ΔBmechanism for fringe-field organic magnetoresistance

Correlation between bias-dependent ESR signals and magnetic field effects in organic light emitting diodes

Pengaruh Medan Magnet pada Pembawa Muatan Lapisan Klorofil Spirulina sp Hasil Spin Coating

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