Observation of the magnetic domain structure in Cu0.47Ni0.53 thin films at low temperatures

Veshchunov, Ivan S.; Oboznov, V. A.; Rossolenko, A. N.; Prokofiev, A.; Rusanov, A. Yu.; Матвеев, Д. В.

doi:10.1134/s0021364008230124

Cited by 35 publications

(21 citation statements)

References 16 publications

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“…Figure 1 shows the typical V M (T) curve and the dependence of the Curie temper ature on the thickness of the ferromagnet. It can be seen that the magnetic properties strongly depend on the temperature and thickness of PdFe films, unlike CuNi films used in [4,7,18]. The thickness of the fer romagnet in Nb-Pd 0.99 Fe 0.01 -Nb junctions studied in this work varied in the range of 30-50 nm and the Curie temperature varied in the range of 10-15 K; i.e., it was close to the critical temperature of niobium superconducting electrodes of junctions.…”

Section: Magnetic Switches Based On Nb-pdfe-nb Josephsonmentioning

confidence: 97%

“…18]) and components M x and M y are zero, the domain structure does not distort the shape of the I c (H) field dependence.…”

mentioning

confidence: 94%

“…This indicated that the domain structure of the ferromagnetic interlayer was quite small scale and its magnetic fields were completely averaged at the scale of the F layer. Moreover, the magnetization of domains in CuNi and PdNi ferromagnetic interlayers used in those works was perpendicular to the plane of the sam ple [18], which led to high coercive fields. The shift of the I c (H) dependence for Nb-CuNi-Nb junctions, which was due to the residual magnetization of the interlayer, was observed for the first time in [19].…”

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confidence: 98%

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Magnetic switches based on Nb-PdFe-Nb Josephson junctions with a magnetically soft ferromagnetic interlayer

et al. 2012

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Section: Magnetic Switches Based On Nb-pdfe-nb Josephsonmentioning

confidence: 97%

“…18]) and components M x and M y are zero, the domain structure does not distort the shape of the I c (H) field dependence.…”

mentioning

confidence: 94%

mentioning

confidence: 98%

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Magnetic switches based on Nb-PdFe-Nb Josephson junctions with a magnetically soft ferromagnetic interlayer

et al. 2012

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“…The ferromagnetic properties of a comparable ferromagnetic compound, Cu 0.47 Ni 0.53 , were investigated recently via anomalous Hall voltage measurements and Bitter decoration techniques of the magnetic domain structures, 33 indicating a magnetic anisotropy and a magnetic structure with domains of about 100 nm in size. Both Hall and Bitter decoration measurements are only sensitive to out-of-plane components of the magnetic fields, and the growth conditions of the CuNi sample in Ref.…”

Section: Magnetic Properties Of the F-layermentioning

confidence: 99%

Magnetic interference patterns in0−πsuperconductor/insulator/ferromagnet/superconductor Josephson junctions: Effects of asymmetry between 0 andπregions

Kemmler

Weides²,

Weiler

et al. 2010

Phys. Rev. B

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We present a detailed analysis of the dependence of the critical current I c on an in-plane magnetic field B of 0, , and 0-superconductor-insulator-ferromagnet-superconductor Josephson junctions. I c ͑B͒ of the 0 and the junction closely follows a Fraunhofer pattern, indicating a homogeneous critical current density j c ͑x͒. The maximum of I c ͑B͒ is slightly shifted along the field axis, pointing to a small remanent in-plane magnetization of the F-layer along the field axis. I c ͑B͒ of the 0-junction exhibits the characteristic central minimum. I c , however, has a finite value here, due to an asymmetry of j c in the 0 and the part. In addition, this I c ͑B͒ exhibits asymmetric maxima and bumped minima. To explain these features in detail, flux penetration being different in the 0 part and the part needs to be taken into account. We discuss this asymmetry in relation to the magnetic properties of the F-layer and the fabrication technique used to produce the 0-junctions.

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“…[22]. Small dimensions were necessary both for mono-domain switching of spin valves (domain size in CuNi is ∼ 100 nm [23]) and for enhancement of junction resistances to comfortably measurable values. Measurements were done either in a He-3 cryostat or in a He-4 gas flow cryostat.…”

mentioning

confidence: 99%

Controllable generation of a spin-triplet supercurrent in a Josephson spin valve

2014

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It has been predicted theoretically that an unconventional odd-frequency spin-triplet component of superconducting order parameter can be induced in multilayered ferromagnetic structures with non-collinear magnetization. In this work we study experimentally nano-scale devices, in which a ferromagnetic spin valve is embedded into a Josephson junction. We demonstrate two ways of in-situ analysis of such Josephson spin valves: via magnetoresistance measurements and via in-situ magnetometry based on flux quantization in the junction. We observe that supercurrent through the device depends on the relative orientation of magnetization of the two ferromagnetic layers and is enhanced in the non-collinear state of the spin valve. This provides a direct prove of controllable generation of the spin-triplet superconducting component in a ferromagnet.An interplay of superconductivity (S) and ferromagnetism (F) in hybrid S/F heterostructures leads to a variety of unusual physical phenomena [1][2][3][4][5][6][7][8][9][10]. Of particular interest is a possibility of generation of an unconventional odd-frequency spin-triplet component of the superconducting condensate [2,7]. The ferromagnetic exchange energy is usually much larger than the superconducting energy gap. Consequently, a conventional spin-singlet superconducting order parameter decays at a short range ∼ 1 nm in a spatially uniform, mono-domain ferromagnet. Experimental observations of a long-range proximity effect through strong ferromagnets [11,12] and, in particular, through almost fully spin-polarized half-metals [13][14][15] is consistent with appearance of the spin-triplet component, which is insensitive to strong magnetic and exchange fields. However, it may also be due to various types of artifacts and, at certain circumstances, a longrange spin-singlet component can be realized in clean S/F heterostructures [9]. Therefore, unambiguous confirmation for existence of the spin-triplet superconductivity in S/F heterostructures requires controllable tunability of the phenomenon. This is also prerequisite for potential applications of S/F heterostructures in spintronics.The spin-triplet order parameter in S/F heterostructures is generated in presence of an active spin-mixing interface [5,7] or in case of a spatially non-uniform distribution of magnetization [2]. The latter can be achieved in spin valve structures with several F-layers [1,3,6,[8][9][10]. Both the spin-singlet and the spin-triplet components depend on the angle between magnetization of F-layers in such superconducting spin valves. The spin-singlet component is at maximum for the antiparallel (AP) and minimum at the parallel (P) state of the spin valve [9]. The spin-triplet component is maximum at the non-collinear state with 90• misalignment between magnetic moments and zero both in P-and AP-states [3,8]. Such a behavior has been confirmed by analysis of the inverse proximity effect (i.e

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Observation of the magnetic domain structure in Cu0.47Ni0.53 thin films at low temperatures

Cited by 35 publications

References 16 publications

Magnetic switches based on Nb-PdFe-Nb Josephson junctions with a magnetically soft ferromagnetic interlayer

Magnetic switches based on Nb-PdFe-Nb Josephson junctions with a magnetically soft ferromagnetic interlayer

Magnetic interference patterns in0−πsuperconductor/insulator/ferromagnet/superconductor Josephson junctions: Effects of asymmetry between 0 andπregions

Controllable generation of a spin-triplet supercurrent in a Josephson spin valve

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