Biomolecule detection using wheatstone bridge giant magnetoresistance (GMR) sensors based on CoFeB spin-valve thin film

Swastika, Pinaka Elda; Antarnusa, Ganesha; Suharyadi, Edi; Kato, Takeshi; Iwata, S.

doi:10.1088/1742-6596/1011/1/012060

Cited by 14 publications

(7 citation statements)

References 7 publications

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“…Therefore, for biomedical applications, one important problem to consider in the use of Fe 3 O 4 nanoparticles is stabilization. To increase their stabilization, Fe 3 O 4 nanoparticles have been stabilized by the formation of polymer layers on the surface of magnetic nanoparticles, using dextran, gen, cell, poly (vinyl alcohol) (PVA), enzyme, protein, gelatin, etc [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

A synthesis of polyethylene glycol (PEG)-coated magnetite Fe₃O₄ nanoparticles and their characteristics for enhancement of biosensor

Antarnusa

Suharyadi

2020

Mater. Res. Express

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The magnetite Fe 3 O 4 nanoparticles were synthesized by using chemical co-precipitation method and these nanoparticles were successfully coated by polyethylene glycol (PEG) with variation concentrations of PEG. The magnetite Fe 3 O 4 nanoparticles used as a bimolecular label (nano-tags), exhibiting a soft magnetic behavior with magnetization (M s ) of 77.16 emu g −1 and coercivity (H c ) of 50 Oe respectively. The polyethylene glycol (PEG) was used as a biocompatible polymer. The x-ray diffraction (XRD) patterns of the Fe 3 O 4 showed that Fe 3 O 4 was well crystallized. It also confirmed the existence of invers spinel. The diffraction peak of 35.4°was used to calculate the crystallite size. The estimation of Fe 3 O 4 average crystallite size is 12 nm, while the PEG-coated Fe 3 O 4 nanoparticles is 8.6 nm. The transmission electron microscopy (TEM) images of Fe 3 O 4 showed that the morphology of magnetite Fe 3 O 4 nanoparticle is spherical in shape with uniform grain size and good dispersibility despite the agglomeration it found in some place. The addition of PEG can decrease the agglomeration and reduce the particle size. The existence of PEG layer on Fe 3 O 4 was confirmed by Fourier transform infrared (FTIR) spectroscopy. The result of Vibrating Sample Magnetometer (VSM) showed that saturation magnetization (M s ) of Fe 3 O 4 nanoparticles decreased from 77.16 to 37.15 emu g −1 with the increase of PEG weight from 0% to 50%. Such Fe 3 O 4 nanoparticles with favorable size and tunable magnetic properties are promising biosensor applications.

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Section: Introductionmentioning

confidence: 99%

A synthesis of polyethylene glycol (PEG)-coated magnetite Fe₃O₄ nanoparticles and their characteristics for enhancement of biosensor

Antarnusa

Suharyadi

2020

Mater. Res. Express

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“…Micromagnetic modeling of the spin-valve films under the NP stray fields shows a complicated structure with various types of magnetization reversal . Additional factors such as demagnetization of the NPs themselves, easy-axis rotation of the NPs, and a nonmagnetic gap between the NPs and ferromagnetic platform were revealed and experimentally observed. , Nevertheless, most of the experimental data are related to the current–voltage characteristics of a spin valve covered by NPs. − A deeper understanding of these results was obtained by analyzing the local magnetization and resistance of a spin valve covered by NPs.…”

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confidence: 99%

Effect of Fe/Fe₃O₄ Nanoparticles Stray Field on the Microwave Magnetoresistance of a CoFeB/Ta/CoFeB Synthetic Ferrimagnet

et al. 2021

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The effect of the stray field of Fe/Fe3O4 nanoparticles on the angular dependence of the microwave absorption derivative in CoFeB/Ta/CoFeB synthetic ferrimagnetic structures and CoFeB films with perpendicular anisotropy is analyzed, and its application for sensor technology is proposed. The effective field of the “platform-particles” system controlled by the magnetic dipole interaction of the CoFeB-Fe/Fe3O4 system decreased to zero in areas where the platform was magnetostatically coupled with nanoparticles. Micromagnetic modeling demonstrated the distribution of magnetization and resistance in local areas of CoFeB/Ta/CoFeB structures under the nanoparticles. The microwave absorption derivative can be used as an indicator of local magnetization switching of the giant magnetoresistance (GMR) structure under scattering fields of NPs or magnetically labeled cells. The limiting sensitivity of the detection method was 2.4 × 107 nanoparticles, which covered the spin-valve surface. We have proposed to combine the advantages of a GMR sensor with wireless technology of microwave reading of magnetoresistance for the detection of magnetically labeled cells.

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“…Nanopartikel Fe3O4 menarik perhatian untuk diteliti baik karena sifat magnetiknya ataupun karena potensinya dalam berbagai aplikasi seperti media penyimpanan data, nanokatalis, biosensing [1], drug delivery, dan MRI contrast agent [2]. Selain itu, dalam bidang elektronik dan instrumentasi, Fe3O4 digunakan sebagai bahan utama dalam pembuatan kumparan konduktor, electromagnetic wave coating materials, dan penyerap gelombang mikro [3].…”

Section: Pendahuluanunclassified

Pengaruh Konsentrasi HCl terhadap Mikrostruktur dan Sifat Kemagnetan Nanopartikel Fe3O4 yang Disintesis dari Pasir Besi Pantai Glagah Kulonprogo

Swastika

Hardheyanti

Prasetyowati

et al. 2021

JSD

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Nanopartikel Fe3O4 yang berasal dari pasir besi pantai Glagah Kulon Progo telah berhasil disintesis menggunakan metode kopresipitasi dengan berbagai variasi konsentrasi HCl (10%, 15%, 25% dan 37%). Pengaruh konsentrasi HCl terhadap mikrostruktur dan sifat kemagnetan dari Fe3O4 dilihat dengan menggunakan XRD, SEM EDX serta VSM. Hasil XRD menunjukkan bahwa Fe3O4 yang dihasilkan memiliki struktur kristal kubik invers spinel. Semakin besar konsentrasi HCl, semakin baik derajat kristalinitasnya. Hasil SEM EDX untuk sampel Fe3O4 dengan konsentrasi HCl 37% menunjukkan ukuran butir (grain) yang hampir sama serta tingkat kemurnian sampel Fe3O4 yang dihasilkan sebesar 100% (Fe 72,42% dan O 27,58%). Hasil VSM menunjukkan Fe3O4 hasil sintesis memiliki sifat superparamagnetik serta bersifat soft magnetic. Nanopartikel Fe3O4 dengan konsentrasi HCl 25% memiliki Hc, Mr dan Mmax masing-masing sebesar 0,0215 T, 11,60 emu/gr dan 36,51 emu/gr. Sedangkan Nanopartikel Fe3O4 dengan konsentrasi HCl 37% memiliki Hc dan Mr yang lebih kecil yaitu masing-masing sebesar 0,0017 T dan 10,83 emu/gr serta Mmax yang lebih besar yaitu 36,82 emu/gr.

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Biomolecule detection using wheatstone bridge giant magnetoresistance (GMR) sensors based on CoFeB spin-valve thin film

Cited by 14 publications

References 7 publications

A synthesis of polyethylene glycol (PEG)-coated magnetite Fe₃O₄ nanoparticles and their characteristics for enhancement of biosensor

A synthesis of polyethylene glycol (PEG)-coated magnetite Fe₃O₄ nanoparticles and their characteristics for enhancement of biosensor

Effect of Fe/Fe₃O₄ Nanoparticles Stray Field on the Microwave Magnetoresistance of a CoFeB/Ta/CoFeB Synthetic Ferrimagnet

Pengaruh Konsentrasi HCl terhadap Mikrostruktur dan Sifat Kemagnetan Nanopartikel Fe3O4 yang Disintesis dari Pasir Besi Pantai Glagah Kulonprogo

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Biomolecule detection using wheatstone bridge giant magnetoresistance (GMR) sensors based on CoFeB spin-valve thin film

Cited by 14 publications

References 7 publications

A synthesis of polyethylene glycol (PEG)-coated magnetite Fe3O4 nanoparticles and their characteristics for enhancement of biosensor

A synthesis of polyethylene glycol (PEG)-coated magnetite Fe3O4 nanoparticles and their characteristics for enhancement of biosensor

Effect of Fe/Fe3O4 Nanoparticles Stray Field on the Microwave Magnetoresistance of a CoFeB/Ta/CoFeB Synthetic Ferrimagnet

Pengaruh Konsentrasi HCl terhadap Mikrostruktur dan Sifat Kemagnetan Nanopartikel Fe3O4 yang Disintesis dari Pasir Besi Pantai Glagah Kulonprogo

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A synthesis of polyethylene glycol (PEG)-coated magnetite Fe₃O₄ nanoparticles and their characteristics for enhancement of biosensor

A synthesis of polyethylene glycol (PEG)-coated magnetite Fe₃O₄ nanoparticles and their characteristics for enhancement of biosensor

Effect of Fe/Fe₃O₄ Nanoparticles Stray Field on the Microwave Magnetoresistance of a CoFeB/Ta/CoFeB Synthetic Ferrimagnet