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Manipulation of Superparamagnetic Beads on Patterned Exchange-Bias Layer Systems for Biosensing Applications

Arno Ehresmann, Iris Koch, Dennis Holzinger
2015 Sensors  
distance, the magnetic properties of both the SPBs and the EB layer system, respectively, as well as by the properties of the external magnetic field pulses and the surrounding fluid.  ...  Although the typical magnetic field strengths emerging from such domains or micro magnets are rather small, the corresponding magnetic field gradients are comparably strong over small distances [50] .  ...  magnetic field The technology platform described in this report enables to create MFLs through defined magnetic domain patterns in continuous and essentially flat Exchange-Bias (EB) layer systems.  ... 
doi:10.3390/s151128854 pmid:26580625 pmcid:PMC4701312 fatcat:a5hqydx3qbeudebssm5ho4rm7q

Influence of Varying Tensile Stress on Domain Motion

Kun Zeng, Guiyun Tian, Jia Liu, Bin Gao, Yi Liu, Qianhang Liu
2022 Materials  
Magnetic domain motion has been widely studied in the fields of spintronics, nanowires, and thin films.  ...  Magnetic domain rotation and domain wall displacement were characterized using magnetic domain images, and their motion mechanisms under elastic and plastic stresses are presented.  ...  Funding: This paper is funded by National Natural Science Foundation of China (NSFC) project No: 61960206010 and No: 61527803.  ... 
doi:10.3390/ma15093399 pmid:35591730 pmcid:PMC9104496 fatcat:4s3q4nkxq5bmneosyvafpgsgku

Role of anti-phase boundaries in the formation of magnetic domains in magnetite thin films [article]

Roberto Moreno, Sarah Jenkins, Vlado K. Lazarov, Richard F. L. Evans
2020 arXiv   pre-print
Understanding their properties is crucial in order to use them to tune the properties of magnetic materials by growing APBs in a controlled way since their density strongly depends on the synthesis method  ...  Anti-phase boundaries (APBs) are structural defects which have been shown to be responsible for the anomalous magnetic behaviour observed in different nanostructures.  ...  Domain walls in cubic systems are more omplex and will be the suject of future work.  ... 
arXiv:2001.01766v1 fatcat:3qxtnt4p65bqvghfoy4yhl3gim

Monte Carlo Simulations of Ferromagnetic Nanocomposites

M. Woińska, A. Majhofer, J. Gosk, J. Szczytko
2012 Acta Physica Polonica. A  
We present results of Monte Carlo simulations of a model system of Co nanoparticles in an external magnetic eld.  ...  In our simulations we take into account the interaction with the external magnetic eld, the energy of crystallographic anisotropy and the dipoledipole interactions between single domain nanoparticles.  ...  This might be Summary In this short report we discuss the results of Monte Carlo simulations of a system of monodisperse superparamagnetic, spherical, single-domain nanoparticles embedded in a magnetically  ... 
doi:10.12693/aphyspola.122.1019 fatcat:mylmwfezbrgafao4hn7kanpyce

Microscopic magnetic squeezer

L. E. Helseth, T. M. Fischer, R. W. Hansen, T. H. Johansen
2004 Applied Physics Letters  
The squeezer has potential applications in microfluidics and also as sensitive pressure gauges for microbiological systems.  ...  A microscopic magnetic squeezer based on two magnetic domain walls moving along a one-dimensional potential well generated by a stress line in ferrite garnet films is demonstrated.  ...  Consequently, the intersection point between the stress line and the domain wall (the origin in the coordinate system) becomes repelling for a magnetic particle trapped on the stress line.  ... 
doi:10.1063/1.1795977 fatcat:kddm6sxt2nf5pi2syevtmaf47y

Observation of a geometrically constrained domain wall in epitaxial FCC Co small disks

C.A.F. Vaz, L. Lopez-Diaz, M. Kläui, J.A.C. Bland, T.L. Monchesky, J. Unguris, Z. Cui
2004 Journal of Magnetism and Magnetic Materials  
The magnetic nanostructure of epitaxial FCC Co/Cuð0 0 1Þ circular elements (B1:7 mm in diameter) has been imaged with scanning electron microscopy with polarisation analysis.  ...  However, the measured width of the 90 domain wall varies with the distance from the vortex core, from 70725 nm up to a value determined by the disk radius.  ...  the vortex core the domain wall width is much wider than the value expected in bulk or continuous film systems (Fig. 1) .  ... 
doi:10.1016/j.jmmm.2003.12.1228 fatcat:656iuge4hvcpde32ymfqcstxty

Effects of long-range tip-sample interaction on magnetic force imaging: A comparative study between bimorph driven system and electrostatic force modulation

Byung I. Kim
2012 Journal of Applied Physics  
The contrast mechanism and imaging stability of MFM using electrostatic force modulation are discussed by investigating the force distance curves obtained in two magnetic domain regions.  ...  In the electrostatic force modulation system, the amplitude increases in the noncontact regime as the tip approaches due to the capacitive coupling between tip and sample.  ...  The following article appeared in Journal of Applied Physics, Volume 111, Issue 10, and may be found at DOI: 10.1063/1.4720577.  ... 
doi:10.1063/1.4720577 fatcat:5qthdyzrqjggdj5mpxpu654eq4

Exchange interaction and magnetic domain formation in periodically inhomogeneous magnetic media

S. Blomeier, B. Hillebrands, B. Reuscher, A. Brodyanski, M. Kopnarski, R. L. Stamps
2008 Physical Review B  
We investigate the formation of magnetic domains in a magnetic trilayer patterned using ion beam bombardment.  ...  The system consists of a finite array of in-plane magnetized ferromagnetic Fe elements embedded into an antiferromagnetically coupled Fe/ Cr/ Fe trilayer.  ...  . 9 In that type of system, magnetic coupling effects were, indeed, detected, but were rather weak and did not significantly distort the magnetic domain configuration within individual elements even  ... 
doi:10.1103/physrevb.77.094405 fatcat:fryoc33lubc5vmjcs53wtdbauq

In situ Kerr microscopy for ultrahigh vacuum applications

J. Giergiel, J. Kirschner
1996 Review of Scientific Instruments  
The performance of the system is illustrated with domain images in a few layers thick Fe films on Cu͑001͒ and W͑110͒.  ...  A simple Kerr microscope designed for in situ investigation of magnetic ultrathin films in ultrahigh vacuum environment is described.  ...  This was used to record magnetization loops while at the same time observing domain patterns. The time to obtain domain images depends on the magnetic system.  ... 
doi:10.1063/1.1147075 fatcat:3ya2nbbqtrhh5hc34qcredracu

Abnormal Behavior of Magnet on Flipping and Using Amazing Behavior of Magnetic Field for Super-Efficient Motor Concept

Akash Yadav
2016 International Journal of Advancements in Technology  
The other is to clear the misconception of magnets that the strength of magnet on other side changes when the magnetic dipoles are shifted in other direction.  ...  The main purpose of doing this experiment is to find out the condition what happen when two magnets are in normal form.  ...  Even in case F the distance b/w magnet in both side is 40mm and having the magnetic power of 300 gauss ( Figure 5 ).  ... 
doi:10.4172/0976-4860.1000165 fatcat:xdsxoul22ndx7jv2sbqe5ecsqq

Measurement of magnetization using domain compressibility in CoFeB films with perpendicular anisotropy

N. Vernier, J.-P. Adam, S. Eimer, G. Agnus, T. Devolder, T. Hauet, B. Ocker, F. Garcia, D. Ravelosona
2014 Applied Physics Letters  
The method also yields the minimal distance between two walls before their merging, which sets a practical limit to the storage density in spintronic devices using domain walls as storage entities.  ...  We present a method to map the saturation magnetization of soft ultrathin films with perpendicular anisotropy, and we illustrate it to assess the compositional dependence of the magnetization of CoFeB(  ...  distances greater than 300 nm (see Fig. 3 ) in high PMA systems 7 where we expect D 30 nm, such that this condition is fulfilled.  ... 
doi:10.1063/1.4869482 fatcat:u3jtsatjavhh7lqhyvzimftatq

Ground State and Magnetostatic Properties of a Dipole System Arranged in Two-Dimensional Lattice

E. Bolcal, V. Dimitrov, B. Aktaş, H. Aslan, A. Bozkurt
2012 Acta Physica Polonica. A  
A system of nano sized modomain ferromagnetic particle arranged in two-dimensional lattice is theoretically investigated.  ...  The basic aim of the investigation is to find the ground state of these types of models where the interaction is long-ranged and anisotropic.  ...  Acknowledgments This work was supported by the Ministry of Industry and Trade of Republic of Turkey (SanTez project N 00185.STZ.2007-2).  ... 
doi:10.12693/aphyspola.121.257 fatcat:i7qpwvdbgff4tfjmdjwaes3xkm

Tailoring the magnetic properties of cobalt antidot arrays by varying the pore size and degree of disorder

S Michea, J L Palma, R Lavín, J Briones, J Escrig, J C Denardin, R L Rodríguez-Suárez
2014 Journal of Physics D: Applied Physics  
We study the influence of the porosity on the domain structure of cobalt antidots thin films with controlled and circular defects of 20, 40 and 60 nm of diameter.  ...  Micromagnetic simulations, combined with First-order reversal curves analysis of classical magnetometry measurements, have been used to track the evolution of the magnetic domain configurations.  ...  In this context, the FORCs diagram technique makes an important contribution to the experimental study of magnetic systems composed of many magnetic particles or magnetic domains.  ... 
doi:10.1088/0022-3727/47/33/335001 fatcat:5lcdyapyzzgpho4e7vcz4x2bvi

Electric and Magnetic Fields from Return Stroke-Lateral Corona System and Red Sprites

Manoj Kumar Paras, Jagdish Rai
2011 Journal of Electromagnetic Analysis and Applications  
Electric and magnetic fields in time and frequency domain due to return stroke-lateral corona (RS-LC) system and recently discovered red sprites have been calculated.  ...  It has been found that the electric and magnetic fields due to return stroke and lateral corona system radiate in the very low frequency (VLF) region while due to sprites radiate in the extremely low frequency  ...  Electric and magnetic fields due to RS-LC system in frequency domain have been shown in Figures 6 and 7 respectively. The radiation fields peak at around 5 kHz.  ... 
doi:10.4236/jemaa.2011.312076 fatcat:r5fbej7iejc5zgwarms5uxbsum

Topological domain walls in helimagnets

P. Schoenherr, J. Müller, L. Köhler, A. Rosch, N. Kanazawa, Y. Tokura, M. Garst, D. Meier
2018 Nature Physics  
Using magnetic force microscopy and micromagnetic simulations, we demonstrate that - similar to cholesteric liquid crystals - three fundamental types of domain walls are realized in the helimagnet FeGe  ...  A magnetic helix arises in chiral magnets with a wavelength set by the spin-orbit coupling.  ...  Domain wall configurations In Fig. 3 of the main text, the numerically obtained energy density and various domain wall configurations were presented for a system size of L = 12λ. In Fig.  ... 
doi:10.1038/s41567-018-0056-5 fatcat:jjzpzykdpfb3bddmhqoeumi5pm
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