• Title/Summary/Keyword: Spin

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A Study on the X-ray Diffraction of Rabbit Glycerin Muscle by Spin Labeled on SH (SH에 Spin Label한 Rabbit Glycerin처리근육의 X선 회절에 관한 연구)

  • 김덕술;송주영
    • Journal of Life Science
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    • v.8 no.6
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    • pp.681-686
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    • 1998

  • IASL(iodo acetamide) and MSL(maleimide) disordered the orderly helix arrangement of myosin in the rest state of spin level. Especially the effect of IASL was great. Equatorial reflection(10,11) change inferred that myosin head was moved to the vicinity of actin filament by spin level. The intensity change of 143 $\AA$ and 72 $\AA$ could offer infor-mation of the mass projection of population of myosin heads along the filament axis. The slope of intensity profile of the mass projection of 143 $\AA$ and reflection of IASL is appeared and that of MSL is appeared sharply. The dec-rease of 215 $\AA$ reflection intensity the periodical characteristic of 143 $\AA$ reflection by spin label. The raise of MSL actin reflection at 51 $\AA$ and 59 $\AA$ in the actin reflection change refers that the shifted myosin head binds a certain actin or changes an actin structure by spin label effect. Because iodo acetamide has a tendency to decease the actin reflection, actin dose not bind myosin head. From this result, we could conclude that LASL and MSL are spin labeled on SH of myosin head and disordered the helix arrangement of actin.

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Spin Wave Interference in Magnetic Nanostructures

  • Yang, Hyun-Soo;Kwon, Jae-Hyun;Mukherjee, Sankha Subhra;Jamali, Mahdi;Hayashi, Masamitsu
    • Proceedings of the Korean Magnestics Society Conference
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    • 2011.12a
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    • pp.7-8
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    • 2011

  • Although yttrium iron garnet (YIG) has provided a great vehicle for the study of spin waves in the past, associated difficulties in film deposition and device fabrication using YIG had limited the applicability of spin waves to practical devices. However, microfabrication techniques have made it possible to characterize both the resonant as well as the travelling characteristics of spin waves in permalloy (Py). A variety of methods have been used for measuring spin waves, including Brillouin light scattering (BLS), magneto-optic Kerr effect (MOKE), vector network analyzer ferromagnetic resonance (VNA-FMR), and pulse inductive microwave magnetometry (PIMM). PIMM is one of the most preferred methodologies of measuring travelling spin waves. In this method, an electrical impulse is applied at one of two coplanar waveguides patterned on top of oxide-insulated Py, producing a local disturbance in the magnetization of the Py. The resulting disturbance travels down the Py in the form of waves, and is inductively picked up by the other coplanar waveguide. We investigate the effect of the pulse width of excitation pulses on the generated spin wave packets using both experimental results and micromagnetic simulations. We show that spin wave packets generated from electrical pulses are a superposition of two separate spin wave packets, one generated from the rising edge and the other from the falling edge, which interfere either constructively or destructively with one another, depending upon the magnitude and direction of the field bias conditions. A method of spin wave amplitude modulation is also presented by the linear superposition of spin waves. We use interfering spin waves resulting from two closely spaced voltage impulses for the modulation of the magnitude of the resultant spin wave packets.

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Magnetic Vortex Oscillators

  • Choi, Youn-Seok;Lee, Ki-Suk;Kim, Sang-Koog
    • Proceedings of the Korean Magnestics Society Conference
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    • 2011.06a
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    • pp.44-44
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    • 2011

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Density Functional Analysis of the Spin Exchange Interactions in VOSb2O4

  • Koo, Hyun-Joo
    • Bulletin of the Korean Chemical Society
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    • v.33 no.7
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    • pp.2338-2340
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    • 2012

  • The spin exchange parameters of $VOSb_2O_4$ were evaluated by performing energy-mapping analysis based on density functional calculations. The spin exchange interaction between the nearest-neighbor $V^{4+}$ ions is strongly antiferromagnetic while other interactions are negligible. Thus, the magnetic structure of $VOSb_2O_4$ is best described by a spin-1/2 Heisenberg antiferromagnetic chain with no spin frustration.

  • https://doi.org/10.5012/bkcs.2012.33.7.2338 인용 PDF KSCI