Multilevel magnetic media in continuous and patterned films with out-of-plane magnetization

Baltz, Vincent; Landis, S.; Rodmacq, B.; Diény, B.

doi:10.1016/j.jmmm.2004.11.449

Cited by 27 publications

(18 citation statements)

References 11 publications

(14 reference statements)

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“…Finally, micron-sized magnetic multilayer structures could have a variety of interesting applications, most notably as potential information carriers in biotechnology and as a three dimensional extension to conventional magnetic memory [33]. The results here presented confirm the suitability of exchange biased multilayer structures for these purposes.…”

Section: Discussionsupporting

confidence: 73%

Digitally Encoded Exchange Biased Multilayers

Barbagallo¹,

Belle²,

Ionescu³

et al. 2008

AIP Conference Proceedings

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There is a high interest in magnetic multilayers for applications in biotechnology. Exchange biased systems are promising candidates for substituting magnetic beads in more complex applications that require each tag to carry digitally encoded information. We have studied the coercivity and exchange bias of Co/PdMn and CoFe/PdMn samples deposited by dc magnetron sputtering as a function of the materials thickness. We also have fabricated a multilayer comprised of four Co/PdMn bilayers that can be encoded in 16 different states, which are stable at zero applied field, thereby enabling the magnetic tag to store 4 bits of information.

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Section: Discussionsupporting

confidence: 73%

Digitally Encoded Exchange Biased Multilayers

Barbagallo¹,

Belle²,

Ionescu³

et al. 2008

AIP Conference Proceedings

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“…However, understanding the switching mechanism of magnetic thin¯lms and multilayers is highly desirable both from a fundamental point of view 4,5 as well as for the successful integration of these layers into devices. 6,7 We report magneto-optical Kerr e®ect (MOKE) imaging of the magnetic domain patterns of individual layer switching during soliton propagation. Two distinct nucleation site densities were observed during soliton propagation.…”

Section: Introductionmentioning

confidence: 99%

Domain Imaging During Soliton Propagation in a 3d Magnetic Ratchet

Mansell

Petit

et al. 2013

SPIN

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The propagation of a kink soliton through a perpendicularly magnetized antiferromagnetically coupled multilayer stack has been imaged by scanning laser Kerr microscopy. The soliton behavior allows layer-by-layer reversal leading to clear evidence of changes of switching behavior of di®erent layers in the stack. We¯nd that the density of domain nucleation sites is dependent on the con¯guration of the neighboring layers as well as height up the stack. By growing a series of single layer and coupled trilayer samples, we are able to explain the trends in nucleation seen in the soliton stack in terms of pinhole and orange peel coupling, in agreement with STEM (Scanning transmission electron microscope) imaging. SPIN 2013.03. Downloaded from www.worldscientific.com by NANYANG TECHNOLOGICAL UNIVERSITY on 08/25/15. For personal use only. Domain Imaging During Soliton Propagation in a 3D Magnetic Ratchet 1340013-5 SPIN 2013.03. Downloaded from www.worldscientific.com by NANYANG TECHNOLOGICAL UNIVERSITY on 08/25/15. For personal use only.

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“…However, interactions between FM layers must also be taken into account and minimized. [17][18][19][20] For example, manipulation of the soft layer has been shown to influence the magnetic configuration of the hard layer, [21][22][23][24] thus limiting functionality. There are a variety of different coupling mechanisms, each with a distinct physical mechanism and include (i) direct magnetic coupling through pinholes in the metallic or insulating spacer layer, 25 (ii) indirect exchange coupling via the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction, 26 (iii) orange peel (Néel) magnetostatic coupling 27,28 due to correlated roughness at both spacer interfaces, and (iv) magnetostatic coupling by stray fields.…”

Section: Introductionmentioning

confidence: 99%

Temperature-dependent interlayer coupling in Ni/Co perpendicular pseudo-spin-valve structures

et al. 2011

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The temperature-dependent coupling mechanisms in perpendicular pseudo-spin valves based on the following structure, [Ni/Co] 5 /Cu(t Cu )/[Ni/Co] 2 , are investigated. Despite a thick (t Cu 3 nm) Cu spacer, room-temperature measurements reveal complete coupling of the [Ni/Co] 5 and [Ni/Co] 2 multilayers. This coupling can be attributed to strong long range magnetostatic stray fields that penetrate the spacer layer. This results in magnetic domain imprinting and vertically correlated domains throughout the reversal process. Surprisingly, when the temperature is reduced, a complete decoupling is observed. This somewhat counterintuitive result can be explained by a large difference in the [Ni/Co] 5 and [Ni/Co] 2 multilayer coercivities at reduced temperatures, which then impedes domain imprinting and promotes decoupling. Finally, the decoupling temperature is found to increase with spacer thickness.

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Multilevel magnetic media in continuous and patterned films with out-of-plane magnetization

Cited by 27 publications

References 11 publications

Digitally Encoded Exchange Biased Multilayers

Digitally Encoded Exchange Biased Multilayers

Domain Imaging During Soliton Propagation in a 3d Magnetic Ratchet

Temperature-dependent interlayer coupling in Ni/Co perpendicular pseudo-spin-valve structures

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