Magnetic bubbles—An emerging new memory technology

Bobeck, A. H.; Bonyhard, P.; Geusic, J. E.

doi:10.1109/proc.1975.9912

Cited by 101 publications

(34 citation statements)

References 46 publications

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“…The figure also shows the dependence h c ( ), which follows from Eqs. (10) and (13). Both these curves, if replotted as functions of −1 , agree excellently with the numerical solutions presented in Fig.…”

Section: 12supporting

confidence: 83%

“…The uniaxial magnetic films, where ferrite garnets is a classical material studied extensively decades ago for use in bubble memory devices, 13,14 may be regarded as a prototype system for stripe domain behavior. Recently, the dynamical behavior of the domains in thick garnet films showed a vast potential for manipulation of micrometer-sized superparamagnetic beads dispersed in a water layer covering the film.…”

Section: 12mentioning

confidence: 99%

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Exact asymptotic behavior of magnetic stripe domain arrays

2013

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Section: 12supporting

confidence: 83%

Section: 12mentioning

confidence: 99%

Exact asymptotic behavior of magnetic stripe domain arrays

2013

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“…For thick enough strips or films with PMA, another type of excitation is expected to become prominent, namely the nucleation of horizontal Bloch lines (HBLs) 11 ; there, the DW chirality changes when moving along the DW in the thickness direction of the sample. These Bloch line structures, in particular in various garnet films, have been intensively studied already in the 1970s as they were at the time seen as potential building blocks of novel types of memory devices, the magnetic bubble memories [13][14][15][16] .…”

Section: Introductionmentioning

confidence: 99%

Bloch-line dynamics within moving domain walls in 3D ferromagnets

Herranen

Laurson

2017

Phys. Rev. B

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We study field-driven magnetic domain wall dynamics in garnet strips by large-scale threedimensional micromagnetic simulations. The domain wall propagation velocity as a function of the applied field exhibits a low-field linear part terminated by a sudden velocity drop at a threshold field magnitude, related to the onset of excitations of internal degrees of freedom of the domain wall magnetization. By considering a wide range of strip thicknesses from 30 nm to 1.89 µm, we find a non-monotonic thickness dependence of the threshold field for the onset of this instability, proceeding via nucleation and propagation of Bloch lines within the domain wall. We identify a critical strip thickness above which the velocity drop is due to nucleation of horizontal Bloch lines, while for thinner strips and depending on the boundary conditions employed, either generation of vertical Bloch lines, or close-to-uniform precession of the domain wall internal magnetization takes place. For strips of intermediate thicknesses, the vertical Bloch lines assume a deformed structure due to demagnetizing fields at the strip surfaces, breaking the symmetry between the top and bottom faces of the strip, and resulting in circulating Bloch line dynamics along the perimeter of the domain wall.

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“…The rapid development of electronic bulk memory technologies (CCD's, RAM's [12], magnetic bubbles [7,9], and electron beam memories [IS]) may make an allelectronic fixed-head disk replacement available very soon. This would allow the construction of a much faster PCAM-based SM which would not be a bottleneck.…”

Section: The Technology Of the Dbcmentioning

confidence: 99%

Concepts and capabilities of a database computer\

Banerjee

Hsiao

Baum

1978

ACM Trans. Database Syst.

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The concepts and capabilities of a database computer (DBC) are given in this paper. The proposed design overcomes many of the traditional problems of database system software and is one of the fust to describe a complete data-secure computer capable of handling large databases. This paper begins by characterizing the major problems facing today's database system designers. These problems are intrinsically related to the nature of conventional hardware and can only be solved by introducing new architectural concepts. Several such concepts are brought to bear in the later sections of this paper. These architectural principles have a major impact upon the design of the system and so they are discussed in some detail. A key aspect of these principles is that they can be implemented with near-term technology. The rest of the paper is devoted to the functional characteristics and the theory of operation of the DBC. The theory of operation is based on a series of abstract models of the components and data structures employed by the DBC. These models are used to illustrate how the DBC performs access operations, manages data structures and security specilications, and enforces security requirements. Short Algol-lie algorithms are used to show how these operations are carried out. This part of the paper concludes with a high-level description of the DBC organization. The actual details of the DBC hardware are quite involved and so their presentation is not the subject of this paper.A sample database is included in the Appendix to illustrate the working of the security and clustering mechanisms of the DBC.

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Magnetic bubbles—An emerging new memory technology

Cited by 101 publications

References 46 publications

Exact asymptotic behavior of magnetic stripe domain arrays

Exact asymptotic behavior of magnetic stripe domain arrays

Bloch-line dynamics within moving domain walls in 3D ferromagnets

Concepts and capabilities of a database computer\

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