Construction of a 3He magnetic force microscope with a vector magnet

Yang, Jinho; Yang, Ilkyu; Kim, Yun Won; Shin, Dongwoo; Jeong, Juyoung; Wulferding, Dirk; Yeom, Han Woong; Kim, Jeehoon

doi:10.1063/1.4941959

Cited by 10 publications

(6 citation statements)

References 34 publications

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“…Magnetic force microscopy (MFM) offers a unique opportunity to extract an absolute value of the in-plane London penetration depth ( ) 34 . The so-called comparative method measures a repulsive force between a magnetic tip and a sample and compares it with that between the tip and a standard sample (Nb).…”

Section: Resultsmentioning

confidence: 99%

“…Magnetic susceptibility was measured with a Magnetic Property Measurement System ( , Quantum Design). The absolute value of the in-plane London penetration depth was measured in a home-built He-MFM probe, operating inside a 3-axis vector magnet (2–2–9 T in the x – y – z direction) 34 . In-plane thermal conductivity was measured by a standard steady-state two-thermometer, one-heater method in a dilution refrigerator.…”

Section: Methodsmentioning

confidence: 99%

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Experimental signatures of nodeless multiband superconductivity in a $$\hbox {2H-Pd}_{0.08} \hbox {TaSe}_2$$ single crystal

Kim

Bhoi

Sur

et al. 2021

Sci Rep

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In order to understand the superconducting gap nature of a $$\hbox {2H-Pd}_{0.08} \hbox {TaSe}_2$$ 2H-Pd 0.08 TaSe 2 single crystal with $$T_{c} = 3.13 \text { K}$$ T c = 3.13 K , in-plane thermal conductivity $$\kappa $$ κ , in-plane London penetration depth $$\lambda _{\text {L}}$$ λ L , and the upper critical fields $$H_{c2}$$ H c 2 have been investigated. At zero magnetic field, it is found that no residual linear term $$\kappa _{0}/T$$ κ 0 / T exists and $$\lambda _{\text {L}}$$ λ L follows a power-law $$T^n$$ T n (T: temperature) with n = 2.66 at $$T \le \frac{1}{3}T_c$$ T ≤ 1 3 T c , supporting nodeless superconductivity. Moreover, the magnetic-field dependence of $$\kappa _{0}$$ κ 0 /T clearly shows a shoulder-like feature at a low field region. The temperature dependent $$H_{c2}$$ H c 2 curves for both in-plane and out-of-plane field directions exhibit clear upward curvatures near $$T_c$$ T c , consistent with the shape predicted by the two-band theory and the anisotropy ratio between the $$H_{c2}$$ H c 2 (T) curves exhibits strong temperature-dependence. All these results coherently suggest that $$\hbox {2H-Pd}_{0.08} \hbox {TaSe}_2$$ 2H-Pd 0.08 TaSe 2 is a nodeless, multiband superconductor.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Experimental signatures of nodeless multiband superconductivity in a $$\hbox {2H-Pd}_{0.08} \hbox {TaSe}_2$$ single crystal

Kim

Bhoi

Sur

et al. 2021

Sci Rep

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“…MFM measurements were performed in a low temperature MFM system with a home-built MFM probe inside a vector magnet with a field and temperature range of 2-2-9 T (in x - y - z direction) and 0.3–300 K, respectively26. All experiments were carried out with commercially available MFM tips (PPP-MFMR, Nanosensors).…”

Section: Methodsmentioning

confidence: 99%

Domain engineering of the metastable domains in the 4f-uniaxial-ferromagnet CeRu2Ga2B

Wulferding

Kim

Yang

et al. 2017

Sci Rep

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In search of novel, improved materials for magnetic data storage and spintronic devices, compounds that allow a tailoring of magnetic domain shapes and sizes are essential. Good candidates are materials with intrinsic anisotropies or competing interactions, as they are prone to host various domain phases that can be easily and precisely selected by external tuning parameters such as temperature and magnetic field. Here, we utilize vector magnetic fields to visualize directly the magnetic anisotropy in the uniaxial ferromagnet CeRu2Ga2B. We demonstrate a feasible control both globally and locally of domain shapes and sizes by the external field as well as a smooth transition from single stripe to bubble domains, which opens the door to future applications based on magnetic domain tailoring.

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“…The resulting dimensions of the measured specimen were 1.5 mm × 1.5 mm × 0.5 mm. MFM measurements were performed using a home-built 3 He MFM probe with a temperature range of 500 mK -300 K. 14 All experiments were carried out using the same commercially available cobalt-alloy coated pyramidal silicon tip with a tip radius of curvature < 50 nm (PPP-MFMR from NANOSENSORS). The force gradient ∂ F/∂ z is obtained from the measured frequency shift…”

mentioning

confidence: 99%

“…In order to minimize the influence from vortices on our local probe experiments, we apply a magnetic field which mostly compensates the stray fields. 14 We can now estimate the strength of the remaining uncompensated stray field H rem by considering the number of vortices N per scanned area A, i.e., H rem = NΦ 0 A . Here, Φ 0 is the magnetic flux quantum.…”

mentioning

confidence: 99%

Local characterization of a heavy-fermion superconductor via sub-Kelvin magnetic force microscopy

Wulferding,

Kim,

Kim

et al. 2020

Preprint

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Using magnetic force microscopy operating at sub-Kelvin temperatures we characterize the heavy-fermion superconductor CeCoIn 5 . We pinpoint the absolute London penetration depth λ (0) = 435 ± 20 nm and report its temperature dependence, which is closely linked to the symmetry of the superconducting gap. In addition, we directly measure the pinning force of individual Abrikosov vortices and estimate the critical current density j c = 9 × 10 4 A/cm 2 . In contrast to the related, well-established tunnel diode oscillator technique, our method is capable of resolving inhomogeneities locally on the micrometer-scale at ultra-low temperature.To date, there is a continuing dispute over the mechanisms that lead to superconductivity in various unconventional and exotic materials, ranging from cuprates 1 to Fe-based compounds 2 to heavy-fermion systems. 3 Hence, a goal is to unambiguously understand the nature of superconductivity in these fundamentally different classes of materials. A key ingredient towards reaching this goal is the symmetry of the superconducting gap, which can help to reveal the pairing mechanism. 4 So far, various approaches have been employed to gain insight into the gap symmetry, 5 from fully bulk methodsspecific heat, 6 nuclear magnetic resonance, 7 tunnel diode oscillator technique 8 -to local and/or surface sensitive probesscanning tunneling spectroscopy, 9 angle-resolved photoemission spectroscopy, 10 Raman spectroscopy. 11 Nevertheless, results obtained from different methods can lead to conflicting conclusions, as each method is plagued by its own drawbacks that might obscure the true gap symmetry in different ways. Consequently, it is of importance to have a variety of complementary techniques at hand.Magnetic force microscopy (MFM) has been shown to be an apt method to measure the superfluid density locally and as a function of temperature in the Fe-pnictide Ba(Fe,Co) 2 As 2 . 12 Here we employ our home-built MFM operating at a base temperature of 500 mK for a local characterization of CeCoIn 5

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Construction of a 3He magnetic force microscope with a vector magnet

Cited by 10 publications

References 34 publications

Experimental signatures of nodeless multiband superconductivity in a $$\hbox {2H-Pd}_{0.08} \hbox {TaSe}_2$$ single crystal

Experimental signatures of nodeless multiband superconductivity in a $$\hbox {2H-Pd}_{0.08} \hbox {TaSe}_2$$ single crystal

Domain engineering of the metastable domains in the 4f-uniaxial-ferromagnet CeRu2Ga2B

Local characterization of a heavy-fermion superconductor via sub-Kelvin magnetic force microscopy

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