Anisotropy of the critical temperature of a superconducting niobium thin film with an array of nanoscale holes in an external magnetic field

Latimer, Michael; Xiao, Z. L.; Hua, J.; Joshi‐Imre, Alexandra; Wang, Yonglei; Divan, Ralu; Kwok, W. K.; Crabtree, G. W.

doi:10.1103/physrevb.87.020507

Cited by 8 publications

(11 citation statements)

References 40 publications

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“…These authors conclude that the magnetoresistance dips are originated from antidot-induced T c suppression; i. e. the Little-Parks effect governs the magnetoresistance minima. Recently, using the Little-Parks effect only, Latimer et al [18] have studied anisotropic properties of Nb films with different hole arrays. On the other hand, moving vortices are needed to explain magnetoresistance oscillations in superconducting films with antidot arrays [19,20].…”

Section: Introductionmentioning

confidence: 99%

Vortex pinning vs superconducting wire network: origin of periodic oscillations induced by applied magnetic fields in superconducting films with arrays of nanomagnets

Gómez¹,

Valle²,

González³

et al. 2014

Supercond. Sci. Technol.

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Abstract. Hybrid magnetic arrays embedded in superconducting films are ideal systems to study the competition between different physical (such as the coherence length) and structural length scales such as available in artificially produced structures. This interplay leads to oscillation in many magnetically dependent superconducting properties such as the critical currents, resistivity and magnetization. These effects are generally analyzed using two distinct models based on vortex pinning or wire network. In this work, we show that for magnetic dot arrays, as opposed to antidot (i.e holes) arrays, vortex pinning is the main mechanism for field induced oscillations in resistance R(H), critical current I c (H), magnetization M(H) and ac-susceptibility  ac (H) in a broad temperature range. Due to the coherence length divergence at T c , a crossover to wire network behaviour is experimentally found. While pinning occurs in a wide temperature range up to T c , wire network behaviour is only present in a very narrow temperature window close to T c . In this temperature interval, contributions from both mechanisms are operational but can be experimentally distinguished.

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Section: Introductionmentioning

confidence: 99%

Vortex pinning vs superconducting wire network: origin of periodic oscillations induced by applied magnetic fields in superconducting films with arrays of nanomagnets

Gómez¹,

Valle²,

González³

et al. 2014

Supercond. Sci. Technol.

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“…In this case it is desirable to have pinning centers whose size is on the order of the coherence length of Nb (around 40 nm [48]) separated by a distance comparable to the London penetration depth (also around 40 nm [49]). Therefore an array of nanoscale holes would be the optimum vortex trapping structure [50]. Note that here we propose to use Nb films whose thickness is smaller than the London penetration depth, and therefore cannot sustain a complete flux exclusion, resulting in lower diamagnetic energy which then leads to a higher critical field [45].…”

Section: Discussionmentioning

confidence: 99%

Circuit-quantum electrodynamics with direct magnetic coupling to single-atom spin qubits in isotopically enriched 28Si

et al. 2014

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Recent advances in silicon nanofabrication have allowed the manipulation of spin qubits that are extremely isolated from noise sources, being therefore the semiconductor equivalent of single atoms in vacuum. We investigate the possibility of directly coupling an electron spin qubit to a superconducting resonator magnetic vacuum field. By using resonators modified to increase the vacuum magnetic field at the qubit location, and isotopically purified 28 Si substrates, it is possible to achieve coupling rates faster than the single spin dephasing. This opens up new avenues for circuit-quantum electrodynamics with spins, and provides a pathway for dispersive read-out of spin qubits via superconducting resonators.

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“…The artificial defects, introduced by FIB milling and mixing, work by pinning of the magnetic flux that enter the material during superconducting current flow. Closely spaced, regular arrays of point dwellings are usually employed to collectively pin the naturally emerging vortex lattice (e.g., [100,101]). In addition to milling-based patterning, it was found that gallium ion beam assisted deposition from tungsten carboxyl gas produces deposits that are superconductive, and wires 300 nm wide, 120 nm thick, and 10 micron long exhibit a critical temperature of 5.2 K. (work done by Sadki et al [102]).…”

Section: Superconductive Structuresmentioning

confidence: 99%

Direct-Write Ion Beam Lithography

Joshi‐Imre

Bauerdick

2014

Journal of Nanotechnology

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Patterning with a focused ion beam (FIB) is an extremely versatile fabrication process that can be used to create microscale and nanoscale designs on the surface of practically any solid sample material. Based on the type of ion-sample interaction utilized, FIB-based manufacturing can be both subtractive and additive, even in the same processing step. Indeed, the capability of easily creating three-dimensional patterns and shaping objects by milling and deposition is probably the most recognized feature of ion beam lithography (IBL) and micromachining. However, there exist several other techniques, such as ion implantation- and ion damage-based patterning and surface functionalization types of processes that have emerged as valuable additions to the nanofabrication toolkit and that are less widely known. While fabrication throughput, in general, is arguably low due to the serial nature of the direct-writing process, speed is not necessarily a problem in these IBL applications that work with small ion doses. Here we provide a comprehensive review of ion beam lithography in general and a practical guide to the individual IBL techniques developed to date. Special attention is given to applications in nanofabrication.

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Anisotropy of the critical temperature of a superconducting niobium thin film with an array of nanoscale holes in an external magnetic field

Cited by 8 publications

References 40 publications

Vortex pinning vs superconducting wire network: origin of periodic oscillations induced by applied magnetic fields in superconducting films with arrays of nanomagnets

Vortex pinning vs superconducting wire network: origin of periodic oscillations induced by applied magnetic fields in superconducting films with arrays of nanomagnets

Circuit-quantum electrodynamics with direct magnetic coupling to single-atom spin qubits in isotopically enriched 28Si

Direct-Write Ion Beam Lithography

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