• Proceedings of the Korean Magnestics Society Conference
• /
• 2007.05a
• /
• pp.236.1-236.1
• /
• 2007

• Proceedings of the Korean Magnestics Society Conference
• /
• 2011.06a
• /
• pp.133-133
• /
• 2011

• Proceedings of the Korean Magnestics Society Conference
• /
• 2013.05a
• /
• pp.54-54
• /
• 2013

• Proceedings of the Korean Magnestics Society Conference
• /
• 2005.06a
• /
• pp.96-97
• /
• 2005

• Journal of Magnetics
• /
• v.12 no.2
• /
• pp.72-76
• /
• 2007

We investigate the spin transfer torque in metallic multilayer system by employing Keldysh non-equilibrium Green function method. We study the dependences of the spin transfer torque on the detailed energy configuration of ferromagnetic, spacer, and lead layers. With Keldysh non-equilibrium Green function method applied to a single band model, we explore spin transfer torque effect in various layer structures and for various material parameters.

• Proceedings of the Korean Magnestics Society Conference
• /
• 2008.12a
• /
• pp.185.2-185.2
• /
• 2008

• Proceedings of the Korean Magnestics Society Conference
• /
• 2008.12a
• /
• pp.46-46
• /
• 2008

• Journal of the Korean Magnetics Society
• /
• v.20 no.4
• /
• pp.160-166
• /
• 2010

X-ray resonant magnetic scattering (XRMS) allows us to extract magnetic depth profiles in magnetic multilayers and magnetization distribution in magnetic nanostructures in element-specific manner using x-ray reflectivity and diffraction. XRMS is explained with a brief introduction and examples of magnetic structures and magnetic switching mechanism in magnetic multilayers and nanostructures.

• The Transactions of the Korean Institute of Electrical Engineers B
• /
• v.51 no.3
• /
• pp.125-132
• /
• 2002

This paper presents a single-phase 3-level PWM inverter to alleviate the harmonic components of output voltage and current under the conditions of identical supply DC voltage and switching frequency to the conventional inverter. Operational principles and analysis are performed, and the switching functions are derived. Deadbeat controller is also designed and implemented for the inverter to keep the output voltage being sinusoidal and to have the high dynamic performances even in the cases of load variations and the partial magnetization of filter inductor. The validity of proposed inverter is proved from the simulated and experimented results.

• Journal of Magnetics
• /
• v.16 no.4
• /
• pp.328-331
• /
• 2011

Here, we describe a dual spin valve structure with distinct switching fields for two pinned layers. A device with this structure has a staircase of three distinct magnetoresistive states. The multiple resistance states are achieved by controlling the exchange coupling between two ferromagnetic pinned layers and two adjacent anti-ferromagnetic pinning layers. The maximum magnetoresistance ratio is 7.9% for the current-perpendicular-to-plane and 7.2% for the current-in-plane geometries, with intermediate magnetoresistance ratios of 3.9% and 3.3%, respectively. The requirements for using this exchange-biased stack as a three-state memory device are also discussed.