Giant magnetoresistance and magnetic interactions in exchange-biased spin-valves

Coehoorn, R.

doi:10.1016/s1567-2719(03)15001-9

Cited by 29 publications

(23 citation statements)

References 679 publications

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“…Assuming coherent rotation of the magnetization in the Py layers in the GMR stack, 35 the FWHM can be estimated as twice the anisotropy field, H a . Thus, our experiments reveal a linear increase of the anisotropy field of the GMR multilayer stack with the stress induced on the top surface of the Si support due to bending.…”

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confidence: 99%

High-performance giant magnetoresistive sensorics on flexible Si membranes

Pérez

Melzer

Makarov

et al. 2015

Applied Physics Letters

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We fabricate high-performance giant magnetoresistive (GMR) sensorics on Si wafers, which are subsequently thinned down to 100 mu m or 50 mu m to realize mechanically flexible sensing elements. The performance of the GMR sensors upon bending is determined by the thickness of the Si membrane. Thus, bending radii down to 15.5mm and 6.8mm are achieved for the devices on 100 mu m and 50 mu m Si supports, respectively. The GMR magnitude remains unchanged at the level of (15.3 +/- 0.4)% independent of the support thickness and bending radius. However, a progressive broadening of the GMR curve is observed associated with the magnetostriction of the containing Ni81Fe19 alloy, which is induced by the tensile bending strain generated on the surface of the Si membrane. An effective magnetostriction value of lambda(s) = 1.7 x 10(-6) is estimated for the GMR stack. Cyclic bending experiments showed excellent reproducibility of the GMR curves during 100 bending cycles

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confidence: 99%

High-performance giant magnetoresistive sensorics on flexible Si membranes

Pérez

Melzer

Makarov

et al. 2015

Applied Physics Letters

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“…Once the patent is established, the respective results can (and must to a certain extent) be published. Furthermore, there are important benefits of in-house research that are independent of the appropriation of the resulting knowledge, for example the benefits of in-house competency regarding current 13 Again, see Coehoorn 2003 for an impressive overview of the development of the field. scientific developments (including the often crucial tacit knowledge involved in the material respects of research) and the more immediate and quicker access to new knowledge that may enable the company to reap first-mover advantages in new and developing markets (cf.…”

Section: Design Rules: Local But Not Provisionalmentioning

confidence: 99%

“…(Cf. Banhart et al 1997, Coehoorn 2003 Note that this insight into an unexpected relevance of SOI and a limitation of the two-current model has only become possible through GMR research. Prior to the experimental study of systems displaying GMR, there simply was no experimental access to the separate conductivities of majority spin and minority spin transport electrons.…”

Section: Spin-off From Spin Researchmentioning

confidence: 99%

Design Rules: Industrial Research and Epistemic Merit

Wilholt

2006

Philos. of Sci.

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A common complaint against the increasing privatization of research is that research that is conducted with the immediate purpose of producing applicable knowledge will not yield knowledge as valuable as that generated in more curiosity-driven, academic settings. In this paper, I make this concern precise and reconstruct the rationale behind it. Subsequently, I examine the case of industry research on the giant magnetoresistance effect in the 1990s as a characteristic example of research undertaken under considerable pressure to produce applicable results. The example permits one to arrive at a more optimistic assessment of the epistemic merits of private, application-driven research. I attempt to specify the conditions that, in this case, advanced the production of interesting and reliable knowledge. ________________ Instrumental Research and the Concerns about Epistemic DeclineWhat epistemic consequences ensue when scientific research is taken over by corporate interests? In this paper, I will examine one important recent example of such a takeover. Among other things, I will describe the role of a certain kind of local model that figures importantly in connecting research efforts with product development and whose occurrences are sometimes aptly called 'design rules'. It is often feared that these and all other results of application-driven research are inevitably pragmatic, provisional or otherwise inferior to the knowledge achieved by curiosity-driven academic science. The ambiguity of this paper's title alludes to these worries: It is reasonable to assume that in industrial research, design rules. Might the demands of successful product design even threaten to overrule the traditional epistemic values of academic science?Quite a few players in public debates about science evidently fear so, and have expressed their concern that the gradual privatization of research will eventually prove detrimental for the epistemic merits of science as a whole.

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“…However, since J EB must be less than K AFM × t AFM [1], the upper limit of J EB is less than 10 erg/cm A collection of tabulated data gathered by Coehoorn [20] is an invaluable database. We gathered the distribution of the values of J EB (taken from Tab.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, in all-metallic FM/AFM systems, the exchange coupling between the FM and AFM species is direct, so that any change in ordering at the interfaces results in a frustration of exchange interactions [26]. all-metallic thin lm systems the EB eld is of the order of 100400 Oe if t FM is of 10 nm [20]. As seen in Table, the product 4πM l 2 ex does not dier much among most of the soft FM materials.…”

Section: Introductionmentioning

confidence: 99%

Micromagnetic Approach to Exchange Bias

Dubowik

Gościańska

2015

Acta Phys. Pol. A

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We present a micromagnetic approach to the exchange bias in ferromagnetic/antiferromagnetic thin lm systems with a small number of irreversible interfacial magnetic moments. We express the exchange bias eld HEB in terms of the fundamental micromagnetic length scale of ferromagnetic the exchange length lex. The benet from this approach is a better separation of the factor related to the ferromagnetic layer from the factor related to the ferromagnetic/antiferromagnetic coupling at interfaces. Using this approach we estimate the upper limit of HEB in real ferromagnetic/antiferromagnetic systems.

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Giant magnetoresistance and magnetic interactions in exchange-biased spin-valves

Cited by 29 publications

References 679 publications

High-performance giant magnetoresistive sensorics on flexible Si membranes

High-performance giant magnetoresistive sensorics on flexible Si membranes

Design Rules: Industrial Research and Epistemic Merit

Micromagnetic Approach to Exchange Bias

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