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Magnetization Process in Vortex-imprinted Ni₈₀Fe₂₀/Ir₂₀Mn₈₀ Square Elements
H. Xu,J. Kolthammer,J. Rudge,E. Girgis,B. C. Choi,Y. K. Hong,G. Abo,Th. Speliotis,D. Niarchos 한국자기학회 2011 Journal of Magnetics Vol.16 No.2
The vortex-driven magnetization process of micron-sized, exchange-coupled square elements with composition of Ni??Fe₂? (12 ㎚)/Ir₂?Mn?? (5 ㎚) is investigated. The exchange-bias is introduced by field-cooling through the blocking temperature (TB) of the system, whereby Landau-shaped vortex states of the Ni??Fe₂? layer are imprinted into the Ir₂?Mn??. In the case of zero-field cooling, the exchange-coupling at the ferromagnetic/antiferromagnetic interface significantly enhances the vortex stability by increasing the nucleation and annihilation fields, while reducing coercivity and remanence. For the field-cooled elements, the hysteresis loops are shifted along the cooling field axis. The loop shift is attributed to the imprinting of displaced vortex state of Ni??Fe₂? into Ir₂?Mn??, which leads to asymmetric effective local pinning fields at the interface. The asymmetry of the hysteresis loop and the strength of the exchange-bias field can be tuned by varying the strength of cooling field. Micromagnetic modeling reproduces the experimentally observed vortex-driven magnetization process if the local pinning fields induced by exchange-coupling of the ferromagnetic and antiferromagnetic layers are taken into account.
Approximating vibronic spectroscopy with imperfect quantum optics
Clements, William R,Renema, Jelmer J,Eckstein, Andreas,Valido, Antonio A,Lita, Adriana,Gerrits, Thomas,Nam, Sae Woo,Kolthammer, W Steven,Huh, Joonsuk,Walmsley, Ian A IOP 2018 Journal of physics B, Atomic, molecular, and optic Vol.51 No.24
<P>We study the impact of experimental imperfections on a recently proposed protocol for performing quantum simulations of vibronic spectroscopy. Specifically, we propose a method for quantifying the impact of these imperfections, optimizing an experiment to account for them, and benchmarking the results against a classical simulation method. We illustrate our findings using a proof of principle experimental simulation of part of the vibronic spectrum of tropolone. Our findings will inform the design of future experiments aiming to simulate the spectra of large molecules beyond the reach of current classical computers.</P>