Investigation of selective realignment of the preferred magnetic direction in spin-valve layer stacks using laser radiation

Berthold, I.; Müller, M.; Klötzer, S.; Ebert, R.; Thomas, Sabu; Matthes, Patrick; Albrecht, Manfred; Exner, Horst

doi:10.1016/j.apsusc.2014.02.133

Cited by 19 publications

(5 citation statements)

References 5 publications

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“…Engineered magnetic domains with deliberately set magnetic properties and designed shapes in thin-film systems have proven to be useful in memory [1–2] and sensor applications [3–5], for stray field design [6–7] and particle transport in lab-on-chip systems [8–11], or in spintronics and magnonics [12–14]. Currently available techniques for domain patterning are either based on focused ion beams (FIB) [15–17], ion implantation [18–21], laser annealing [22–24], thermally assisted scanning probe lithography [25], or a combination of spatially broad laser- or ion-beams and shadow masks [26–30]. Especially in magnonic [14] and sensor applications [4] in-plane magnetic domain patterns play a key role and are one of the objectives of recent research to create tailored domain shapes on the one hand and to minimize the domains to the nanometer regime on the other hand.…”

Section: Introductionmentioning

confidence: 99%

Size limits of magnetic-domain engineering in continuous in-plane exchange-bias prototype films

Gaul

Emmrich

Ueltzhöffer

et al. 2018

Beilstein J. Nanotechnol.

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Background: The application of superparamagnetic particles as biomolecular transporters in microfluidic systems for lab-on-a-chip applications crucially depends on the ability to control their motion. One approach for magnetic-particle motion control is the superposition of static magnetic stray field landscapes (MFLs) with dynamically varying external fields. These MFLs may emerge from magnetic domains engineered both in shape and in their local anisotropies. Motion control of smaller beads does necessarily need smaller magnetic patterns, i.e., MFLs varying on smaller lateral scales. The achievable size limit of engineered magnetic domains depends on the magnetic patterning method and on the magnetic anisotropies of the material system. Smallest patterns are expected to be in the range of the domain wall width of the particular material system. To explore these limits a patterning technology is needed with a spatial resolution significantly smaller than the domain wall width. Results: We demonstrate the application of a helium ion microscope with a beam diameter of 8 nm as a mask-less method for local domain patterning of magnetic thin-film systems. For a prototypical in-plane exchange-bias system the domain wall width has been investigated as a function of the angle between unidirectional anisotropy and domain wall. By shrinking the domain size of periodic domain stripes, we analyzed the influence of domain wall overlap on the domain stability. Finally, by changing the geometry of artificial two-dimensional domains, the influence of domain wall overlap and domain wall geometry on the ultimate domain size in the chosen system was analyzed. Conclusion: The application of a helium ion microscope for magnetic patterning has been shown. It allowed for exploring the fundamental limits of domain engineering in an in-plane exchange-bias thin film as a prototypical system. For two-dimensional domains the limit depends on the domain geometry. The relative orientation between domain wall and anisotropy axes is a crucial parameter and therefore influences the achievable minimum domain size dramatically.

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Section: Introductionmentioning

confidence: 99%

Size limits of magnetic-domain engineering in continuous in-plane exchange-bias prototype films

Gaul

Emmrich

Ueltzhöffer

et al. 2018

Beilstein J. Nanotechnol.

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“…The current amplitude should be carefully calculated and a particular printed circuit board is required. A similar method uses laser radiation in an applied field in place of the setting circuit [24] .…”

Section: Wheatstone Bridge Configurationmentioning

confidence: 99%

Developments and applications of tunneling magnetoresistance sensors

Yan

Zhou

Yang

et al. 2022

Tsinghua Sci. Technol.

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Magnetic sensors based on tunneling magnetoresistance (TMR) effect exhibit high sensitivity, small size, and low power consumption. They have gained a lot of attention and have potential applications in various domains.This study first introduces the development history and basic principles of TMR sensors. Then, a comprehensive description of TMR sensors linearization and Wheatstone bridge configuration is presented. Two key performance parameters, the field sensitivity and noise mechanisms, are considered. Finally, the emerging applications of TMR sensors are discussed.

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“…The amplitude of the current should be carefully calculated and a particular PCB is needed. A similar way is to use laser radiation in an applied field in place of the setting circuit [ 15 , 16 ]. However, all these methods are more or less complex.…”

Section: Introductionmentioning

confidence: 99%

Design and Fabrication of Full Wheatstone-Bridge-Based Angular GMR Sensors

Yan

Cao

Guo

et al. 2018

Sensors

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Since the discovery of the giant magnetoresistive (GMR) effect, GMR sensors have gained much attention in last decades due to their high sensitivity, small size, and low cost. The full Wheatstone-bridge-based GMR sensor is most useful in terms of the application point of view. However, its manufacturing process is usually complex. In this paper, we present an efficient and concise approach to fabricate a full Wheatstone-bridge-based angular GMR sensor by depositing one GMR film stack, utilizing simple patterned processes, and a concise post-annealing procedure based on a special layout. The angular GMR sensor is of good linear performance and achieves a sensitivity of 0.112 mV/V/Oe at the annealing temperature of 260 °C in the magnetic field range from −50 to +50 Oe. This work provides a design and method for GMR-sensor manufacturing that is easy for implementation and suitable for mass production.

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Investigation of selective realignment of the preferred magnetic direction in spin-valve layer stacks using laser radiation

Cited by 19 publications

References 5 publications

Size limits of magnetic-domain engineering in continuous in-plane exchange-bias prototype films

Size limits of magnetic-domain engineering in continuous in-plane exchange-bias prototype films

Developments and applications of tunneling magnetoresistance sensors

Design and Fabrication of Full Wheatstone-Bridge-Based Angular GMR Sensors

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