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  • 1
    Electronic Resource
    Electronic Resource
    Ferromagnetic resonance and exchange anisotropy in ferromagnetic/antiferromagnetic bilayers (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 2180-2185 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this article, we study the in-plane ferromagnetic resonance (FMR) and exchange anisotropy in a ferromagnetic (FM)/antiferromagnetic (AFM) bilayer. In the semi-infinite limit for the AFM layer, the equilibrium energy for the system is established, and then analytical expressions are derived for FMR frequency, frequency linewidth, exchange anisotropy constant, effective exchange bias, and pinning angle. Three physical parameters are important, i.e., the classical exchange bias, the interface turning coefficient, and the applied field angle. Combining the formulas derived with numerical calculation, it is shown that there are two branches of FMR modes distinguished by critical fields which depend on the interface turning the coefficient and the applied field angle. We find that the effective exchange bias depends on the applied field angle but not on its magnitude. A comparison with previously reported theoretical results is made, and experimental measurements for physical parameters are suggested. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1433927
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  • 2
    Electronic Resource
    Electronic Resource
    Thickness and angular dependencies of exchange bias in ferromagnetic/antiferromagnetic bilayers (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 92 (2002), S. 1009-1013 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A generalized Meiklejohn–Bean model in which the exchange coupling includes bilinear (direct exchange) and biquadratic (spin–flop) terms is proposed to study the exchange bias in ferromagnetic (FM)/antiferromagnetic (AFM) bilayers. For the strong antiferromagnetic anisotropy, an explicit formula for the exchange bias is derived and used to discuss the thickness and angular dependencies, and a lot of recent experimental results can thus be illustrated. The results show that both the critical thickness of the antiferromagnetic layer displaying the exchange bias and the saturation value of the exchange bias depend on the exchange coupling constants, the angle between the FM easy axis and AFM easy axis, as well as the orientation of an applied field. The bilinear and biquadratic terms will provide competitive contributions to the exchange bias, while the angular variation of the applied field can tune the exchange bias. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1486020
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  • 3
    Electronic Resource
    Electronic Resource
    Reduction in the Sodium Currents in Isolated Ventricular Myocytes of Guinea Pigs Treated by Chronic L-Thyroxin Medication (2002)
    350 Main Street , Malden , MA 02148 , USA. , and 9600 Garsington Road , Oxford OX4 2DQ , England . : Blackwell Science Inc
    Journal of cardiac surgery 17 (2002), S. 0 
    Details
    ISSN: 1540-8191
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Objective: Cardiac remodeling induced by chronic medication of L-thyroxin is manifested by a much more severe cardiac arrhythmias on the occlusion/reperfusion of the coronary artery in rats. A pattern of changes in ion currents in a diseased heart (L-thyroxin induced cardiac remodeling) is possibly provided as a basis of promoting malignant cardiac arrhythmias. An enhanced delayed outward rectifier potassium currents the rapid (IKr) and slow (IKS) component was found in the remodeled heart by L-thyroxin chronic medication. It is interested to investigate the changes in the sodium currents in the L-thyroxin remodeled guinea pig ventricle. Method: The remodeling model in guinea pig was developed by L-thyroxin 4 mg po for 10 days. On d 11, the heart was removed and perfused to isolate ventricular myocytes with medium of Ca2+ free medium containing collagen. The whole cell holding technique was applied. Results: The INa density in the L-thyroxin caused hypertrophied myocytes was reduced significantly at holding potential −30 mV, −53.20 +/−10.78pA/pF against −73.78+/−14.66pA/pF in the normal. (n = 45, p 〈 0.001). No difference in the steady-state inactivation and recovery kinetics between the remodeled and the normal was found. The recovery constant 37.54+/−3.63 ms in the remodeled vs 36.57+/−2.81 ms in the normal (n = 18, p 〉 0.05). The accelerated deactivation time constant 3.67+/−0.14 of the remodeled (n = 39) against the normal 4.14+/−0.15 ms (n = 43) (p 〈 0.05). Conclusion: There is a reduced INa in the L-thyroxin remodeled ventricular myocytes and the deactivation of the current is accelerated. A changed depolarization of the affected myocardium is likely involved in the mechanism of arrhythmogenesis of the remodeled ventricle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1540-8191.2002.101415.x
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  • 4
    Electronic Resource
    Electronic Resource
    Mechanistic Studies on Human Platelet Isoprenylated Protein Methyltransferase: Farnesylcysteine Analogs Block Platelet Aggregation without Inhibiting the Methyltransferase (1994)
    s.l. : American Chemical Society
    Biochemistry 33 (1994), S. 5414-5420 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00184a009
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  • 5
    Electronic Resource
    Electronic Resource
    Inhibitors of the isoprenylated protein endoprotease (1993)
    s.l. : American Chemical Society
    Biochemistry 32 (1993), S. 2386-2393 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00060a033
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  • 6
    Electronic Resource
    Electronic Resource
    Corrections - Inhibitors of the Isoprenylated Protein Endoprotease (1993)
    s.l. : American Chemical Society
    Biochemistry 32 (1993), S. 5924-5924 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00073a600
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  • 7
    Electronic Resource
    Electronic Resource
    Long-range coupling interactions in ferroelectric sandwich structures (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 5031-5035 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We study the ferroelectric system consisting of the sandwich structure (PbTiO3/BaTiO3/PbTiO3) by using the Ginzburg–Landau phenomenological theory, and emphasize the importance of the long-range coupling interaction to the ferroelectric behavior of the system. We find that after introducing the long-range coupling interaction to the ferroelectric behavior of the sandwich system, the average spontaneous polarization of the interlayer (BaTiO3) increases and a size-driven phase transition disappears. The larger the range of the long-range coupling, the larger the average spontaneous polarization. When the range of the long-range coupling is large enough, the average spontaneous polarization increases gradually with decreasing interlayer thickness, reaches one maximum at a certain finite thickness, and then decreases. The spatial distribution profile of the spontaneous polarization on the range of the coupling interaction for different values of the interlayer thickness is obtained, and the dependence of the averaged polarization on temperature is also examined. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1359157
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  • 8
    Electronic Resource
    Electronic Resource
    Finite-temperature coercivity of multilayers of hard and soft magnets (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 1583-1586 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We discuss results of finite-temperature Monte Carlo simulation for the switching field of multilayers of hard and soft magnets. The maximum of the energy product as a function of the soft layer thickness is very weak and becomes weaker as the temperature is increased. However, the maximum becomes more pronounced for the energy product cost as a function of the soft layer thickness. The effect of the dipolar interaction is significant but does not change the qualitative trend of the coercive field as a function of the soft layer thickness. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373858
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetic shield for wide-bandwidth magnetic measurements for nondestructive testing and biomagnetism (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 2654-2661 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A magnetically shielded chamber has been designed and constructed for nondestructive testing and biomagnetic measurements with a high spatial resolution SQUID magnetometer. The shield consists of two layers of 1.6-mm-thick, high permeability alloy and two layers of 1.3-cm-thick aluminum, and has interior dimensions of 0.6×1.2×1.7 m. Except at 60 Hz, the noise level above 10 Hz is 12 fT/(square root of)Hz. The major noise, due to the 60 Hz power line, has been reduced to 8–36 fT/(square root of)Hz. The thermal noise generated by the shield does not affect the measurement inside the shield. At the center of the shield, the shielding factor against the earth's static magnetic field is 500, and the ac shielding factor at 60 Hz is larger than 3×105. The results have been discussed and compared with the calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142195
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  • 10
    Electronic Resource
    Electronic Resource
    Vacancy-assisted domain growth in amphiphilic systems: Monte Carlo simulation (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 6398-6403 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We study the phase separation of amphiphilic systems with vacancies using Monte Carlo simulation of Larson models. We try to clarify the effect of vacancy on the domain growth of a microemulsion at different quench temperatures, and obtain the phase-separating morphology, the time evolution of the structure factor, and the characteristic length scale of the system. It is found that for the deep quench case, vacancies tend to locate at interfaces and accelerate phase separation. However, for shallow quenches an amount of vacancies migrates into the bulk phase and domain growth kinetics assisted by vacancies at interfaces is balanced by the lowering interface tension of vacancies. This has been attributed to the interplay between vacancy-mediated segregation dynamics and reduction of driving force for the phase separation through vacancies at interface, depending on the quench temperatures. On the contrary, all the amphiphile molecules are still deposited onto interfaces even for high temperatures because of the chain properties of the amphiphiles. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1308282
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