Recent trends and perspectives of nanoSQUIDs: introduction to ‘Focus on nanoSQUIDs and their applications’

Líu, Hao; Granata, C.

doi:10.1088/1361-6668/aa68d6

Cited by 15 publications

(7 citation statements)

References 35 publications

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“…In particular, high chemical and thermal stabilities, good display performance and a large magneto-crystalline anisotropy (MAE) of the ordered binary FePt MnPt, and CrPt 3 alloys made them superior to other binary alloys used in magneto-optical recording devices [1,2,3,4] communication devices [5], optical filters [6], biomedical applications [7] and spintronic applications [8,9]. The FePt and MnPt binary alloys are considered as potential candidates for state-of-art spintronic applications like magnetic random access memory (MRAM) [10,11] and drivers in micro-and nano-electromechanical systems (MEMS/NEMS) [12,13,14,15,16]. It has been reported that high-purity L1 0 FePt NPs could be obtained by controlling the proportion of iron and platinum only in the vicinity of the equiatomic composition [17].…”

Section: Introductionmentioning

confidence: 99%

Structural, electronic and magnetic properties of the ordered binary FePt, MnPt, and CrPt3 alloys

Alsaad

Obeidat

2020

Heliyon

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We perform ab initio simulations to investigate the structural, electronic and magnetic properties of the ordered binary FePt, MnPt, and CrPt3 alloys. In particular, equilibrium structural lattice parameters, electronic properties such as density of states (DOS), partial density of states (PDOS) and electronic band structure of each binary alloys are investigated and interpreted. Moreover, the magneto-crystalline anisotropy energies (MAE) are calculated. We found MAE values of FePt, MnPt and CrPt 3 ordered alloys to be 2.66, 0.46 and 0.42 meV/f.u., respectively, corresponding to magneto-crystalline anisotropy constant K of 7.6 Â 10 7 , 1.3 Â 10 7 and 1.1 Â 10 7 erg/cm 3 , respectively. The large MAE and K values reveal that FePt, MnPt and CrPt 3 binary alloys are eligible to be key components in magneto-optical and opto-electronic devices. In addition, we estimated the Curie temperatures of the three ordered alloys from exchange energy. We found the T C of L1 0 -FePt, L1 0 -MnPt and L1 2 CrPt 3 to be 955 K, 989 K and 762 K, respectively. The high Curie temperatures obtained enable the ordered alloys to serve as write assist in Heat-Assisted Magnetic Recording (HAMR). We believe that our findings would pave the way to fabricate bulk and thin films based on the ordered binary FePt, MnPt, and CrPt 3 ordered alloys that have attractive electronic and magnetic properties.

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Section: Introductionmentioning

confidence: 99%

Structural, electronic and magnetic properties of the ordered binary FePt, MnPt, and CrPt3 alloys

Alsaad

Obeidat

2020

Heliyon

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“…In recent years, there has been growing interest in the development of nano-SQUIDs (superconducting quantum interference devices) capable of measuring single atomic spins (see, e.g., review articles [1,2] and references therein). The standard approach to fabricating nano-SQUIDs is to reduce both the size of the involved Josephson junctions and the superconducting loop connecting the two junctions (in DC geometry).…”

Section: Introductionmentioning

confidence: 99%

Peculiar interference pattern of Josephson junctions involving periodic ferromagnet-normal metal structure

Nevirkovets

Mukhanov

2018

Supercond. Sci. Technol.

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We report the observation of an oscillatory behavior of the critical current versus magnetic field dependence in Nb/(Al/Py) 5 /Al/AlO x /(Al/Py) 6 /Al/Nb Josephson tunnel junctions at 4.2 K. The oscillations resemble those that occur in superconducting quantum interference devices. Since the oscillations occur in the junctions without any superconducting loop, and therefore are suitable for sub-micrometer miniaturization, we believe they are promising for the development of a new generation of field-sensitive nanodevices.

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“…Promising candidates for this task are nanoSQUIDs, i.e. strongly miniaturized superconducting quantum interference devices [7][8][9][10]. A SQUID consists of a superconducting loop, intersected by one or two weak links (Josephson junctions).…”

Section: Introductionmentioning

confidence: 99%

On the coupling of magnetic moments to superconducting quantum interference devices

Linek,

Wyszynski,

Müller

et al. 2024

Supercond. Sci. Technol.

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We investigate the coupling factor Φμ that quantifies the magnetic flux Φ, per magnetic moment μ of a point-like magnetic dipole that couples to a superconducting quantum interference device (SQUID).Representing the dipole by a tiny current-carrying (Amperian) loop, the reciprocity of mutual inductances of SQUID and Amperian loop provides an elegant way of calculating Φμ ( r,ê μ ) vs.~position r and orientation ê μ of the dipole anywhere in space from the magnetic field B( r ) produced by a supercurrent circulating in the SQUID loop.We use numerical simulations based on London and Ginzburg-Landau theory to calculate Φμ from the supercurrent density distributions in various SQUID geometries.We treat the far-field regime (r ≧ a = inner size of the SQUID loop) with the dipole placed on (oriented along) the symmetry axis of circular or square shaped loops.We compare expressions for Φμ from simple filamentary loop models with simulation results for loops with finite width w (outer size A > a), thickness d and London penetration depth λ L and show that for thin (d << a) and narrow (w < a) loops the introduction of an effective loop size a eff in the filamentary loop-model expressions results in good agreement with simulations.For a dipole placed right in the center of the loop, simulations provide an expression Φμ (a,A,d,λ L) that covers a wide parameter range.In the near-field regime (dipole centered at small distance z above one SQUID arm) only coupling to a single strip representing the SQUID arm has to be considered.For this case, we compare simulations with an analytical expression derived for a homogeneous current density distribution, which yields excellent agreement for λ L > w,d.Moreover, we analyze the improvement of Φμ provided by the introduction of a narrow constriction in the SQUID arm below the magnetic dipole.

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Recent trends and perspectives of nanoSQUIDs: introduction to ‘Focus on nanoSQUIDs and their applications’

Cited by 15 publications

References 35 publications

Structural, electronic and magnetic properties of the ordered binary FePt, MnPt, and CrPt3 alloys

Structural, electronic and magnetic properties of the ordered binary FePt, MnPt, and CrPt3 alloys

Peculiar interference pattern of Josephson junctions involving periodic ferromagnet-normal metal structure

On the coupling of magnetic moments to superconducting quantum interference devices

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