Imaging of surface spin textures on bulk crystals by scanning electron microscopy

Akamine, Hiroshi; Okumura, So; Farjami, Sahar; Murakami, Yasukazu; Nishida, Minoru

doi:10.1038/srep37265

Cited by 9 publications

(3 citation statements)

References 33 publications

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“…The observation of a non-zero spin texture in the HM species is important for the emergence of skyrmions in magnetic stack systems. Direct observation of such spin textures could facilitate the advancement of spintronic technologies [ 68 ], such as magnetic data encoding to spin domains. Considering that the electronic ground state in bulk Pt is just like that in bulk Pd, both metals satisfy the Stoner criterion for weak ferromagnetism due to the SOC-induced splitting of the degenerate 5 d bands.…”

Section: Resultsmentioning

confidence: 99%

Emergence of Nontrivial Spin Textures in Frustrated Van Der Waals Ferromagnets

Ukpong

2021

Nanomaterials

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In this work, first principles ground state calculations are combined with the dynamic evolution of a classical spin Hamiltonian to study the metamagnetic transitions associated with the field dependence of magnetic properties in frustrated van der Waals ferromagnets. Dynamically stabilized spin textures are obtained relative to the direction of spin quantization as stochastic solutions of the Landau–Lifshitz–Gilbert–Slonczewski equation under the flow of the spin current. By explicitly considering the spin signatures that arise from geometrical frustrations at interfaces, we may observe the emergence of a magnetic skyrmion spin texture and characterize the formation under competing internal fields. The analysis of coercivity and magnetic hysteresis reveals a dynamic switch from a soft to hard magnetic configuration when considering the spin Hall effect on the skyrmion. It is found that heavy metals in capped multilayer heterostructure stacks host field-tunable spiral skyrmions that could serve as unique channels for carrier transport. The results are discussed to show the possibility of using dynamically switchable magnetic bits to read and write data without the need for a spin transfer torque. These results offer insight to the spin transport signatures that dynamically arise from metamagnetic transitions in spintronic devices.

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Section: Resultsmentioning

confidence: 99%

Emergence of Nontrivial Spin Textures in Frustrated Van Der Waals Ferromagnets

Ukpong

2021

Nanomaterials

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“…Furthermore, a separate analysis of all APs indicates a field-induced phase transition as pictured in Figure b–i . AP at 60 K (Figure e) indicates at least three field-induced magnetic phases, and their spin texture can be confirmed using direct imaging techniques. − Although the concave curvature of AP indicates a paramagnetic nature, the field-induced phase transition indicates that locally ordered spin states may also exist. A similar picture can be realized in the AP at 80 K (Figure f), but it is not prominent as in Figure e .…”

mentioning

confidence: 94%

Lattice-Distortion-Induced Change in the Magnetic Properties in Br-Defect Host CsPbBr₃Perovskite Quantum Dots

Kumar

Chauhan

Nagal

et al. 2023

J. Phys. Chem. Lett.

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Herein, we report temperature-and field-induced magnetic states in CsPbBr 3 perovskite quantum dots (PQDs) attributed to Br defects. We find that temperaturedependent structural distortion is the main source of various temperature-induced magnetic states in Br-defect host CsPbBr 3 PQDs. Comprehensively examined magnetization data through Arrott plots, Langevin and Brillouin function fitting, and structural analysis reveal the presence of various oxidation states (i.e., Pb 0 , Pb + , Pb 2+ , and Pb 3+ ) yielding different magnetic states, such as diamagnetic states above 90 K, paramagnetic states below ≈90 K, and perhaps locally ordered states between 58 and 90 K. It is realized from theoretical fits that paramagnetic ions exist (i.e., superparamagnetic behavior) due to Br defects causing Pb + (and/ or Pb 3+ ions) in the diamagnetic region. We anticipate that our findings will spur future research of the development of spin-optoelectronics, such as spin light-emitting diodes, and spintronics devices based on CsPbBr 3 PQDs.

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“…Polarized light microscopy is an excellent tool for this purpose and has been successfully applied to ferromagnetic 1 , ferroelastic 2 and ferroelectric 3,4 domain imaging. Alternative methods for imaging of magnetic domains include Bitter decoration 5 , Lorentz microscopy 6 , electron holography 7 , magnetic force microscopy 8 , scanning SQUID microscopy 9 , scanning Hall probe microscopy 10 , nitrogen vacancy center microscopy 11 , X-ray magnetic circular dichroism 12 , scanning electron microscopy (SEM) 13 , and SEM with polarization analysis (SEMPA) 14 . A comparison of most of these methods can be found in Ref.…”

Section: Introductionmentioning

confidence: 99%

A high-resolution combined scanning laser and widefield polarizing microscope for imaging at temperatures from 4 K to 300 K

Lange¹,

Guénon²,

Lever³

et al. 2017

Review of Scientific Instruments

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Polarized light microscopy, as a contrast-enhancing technique for optically anisotropic materials, is a method well suited for the investigation of a wide variety of effects in solid-state physics, as for example birefringence in crystals or the magneto-optical Kerr effect (MOKE). We present a microscopy setup that combines a widefield microscope and a confocal scanning laser microscope with polarization-sensitive detectors. By using a high numerical aperture objective, a spatial resolution of about 240 nm at a wavelength of 405 nm is achieved. The sample is mounted on a 4 He continuous flow cryostat providing a temperature range between 4 K and 300 K, and electromagnets are used to apply magnetic fields of up to 800 mT with variable in-plane orientation and 20 mT with out-of-plane orientation. Typical applications of the polarizing microscope are the imaging of the in-plane and out-of-plane magnetization via the longitudinal and polar MOKE, imaging of magnetic flux structures in superconductors covered with a magneto-optical indicator film via Faraday effect or imaging of structural features, such as twin-walls in tetragonal SrTiO 3 . The scanning laser microscope furthermore offers the possibility to gain local information on electric transport properties of a sample by detecting the beam-induced voltage change across a current-biased sample. This combination of magnetic, structural and electric imaging capabilities makes the microscope a viable tool for research in the fields of oxide electronics, spintronics, magnetism and superconductivity.

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Imaging of surface spin textures on bulk crystals by scanning electron microscopy

Cited by 9 publications

References 33 publications

Emergence of Nontrivial Spin Textures in Frustrated Van Der Waals Ferromagnets

Emergence of Nontrivial Spin Textures in Frustrated Van Der Waals Ferromagnets

Lattice-Distortion-Induced Change in the Magnetic Properties in Br-Defect Host CsPbBr₃Perovskite Quantum Dots

A high-resolution combined scanning laser and widefield polarizing microscope for imaging at temperatures from 4 K to 300 K

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Imaging of surface spin textures on bulk crystals by scanning electron microscopy

Cited by 9 publications

References 33 publications

Emergence of Nontrivial Spin Textures in Frustrated Van Der Waals Ferromagnets

Emergence of Nontrivial Spin Textures in Frustrated Van Der Waals Ferromagnets

Lattice-Distortion-Induced Change in the Magnetic Properties in Br-Defect Host CsPbBr3Perovskite Quantum Dots

A high-resolution combined scanning laser and widefield polarizing microscope for imaging at temperatures from 4 K to 300 K

Contact Info

Product

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Lattice-Distortion-Induced Change in the Magnetic Properties in Br-Defect Host CsPbBr₃Perovskite Quantum Dots