A. D. LaForge

University of California, Santa Cruz

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A. A. Schafgans

Association for Symbolic Logic

Kenneth S. Burch

Boston College

D. N. Basov

Columbia University

Yoichi Ando

University of Cologne

Willie J. Padilla

Duke University

Kouji Segawa

Kyoto Sangyo University

S. V. Dordevic

University of Akron

D. N. Basov

Columbia University

Michael Purvis

ASML (Netherlands)

Igor V. Fomenkov

N.D. Zelinsky Institute of Organic Chemistry

Cooperative Institutions

University of California, San Diego

Rutgers, The State University of New Jersey

Los Alamos National Laboratory

Brookhaven National Laboratory

Osaka University

Center for Integrated Nanotechnologies

National High Magnetic Field Laboratory

University of California, Santa Cruz

Optical Sciences (United States)

The University of Tokyo

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High-power EUV light sources (>500w) for high throughput in next-generation EUV lithography tools

Klaus Hummler Qiushi Zhu Keegan Behm Liane M. Matthes Zhaohan He

Extreme Ultraviolet Lithography

10.1117/12.3010463

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Infrared probe of rare-earth orthoferrite materials

APS (2011)

A. D. LaForge Soonjae Moon Dimitri Basov A. P. Ramirez Z. Schlesinger

Orthoferrite

Source

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CCDC 913438: Experimental Crystal Structure Determination

The Cambridge Structural Database (2013)

Honghan Fei A. D. LaForge Tedmann M. Onyango Jeremy C. Robins Peter Y. Zavalij

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/ccznhrv

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Synthesis and magnetic properties of a 3-D nickel hydroxide capped by succinate

Journal of Materials Chemistry C (2012)

Honghan Fei A. D. LaForge Tedmann M. Onyango Jeremy C. Robins Peter Y. Zavalij

We have successfully synthesized a rare example of an open framework nickel oxide with succinate capping the channels. A honeycomb-like layer of 14-membered rings centered in the (11) plane are connected by vertex-sharing NiO6 octahedra and water resides in the channels. The structure is only the second example of an extended inorganic–organic hybrid material containing 3-D Ni–O–Ni connectivity and was structurally characterized by single-crystal and powder X-ray diffraction. The material displays excellent chemical stability in aqueous solution from pH ∼ 1 to 13 and thermal stability to ∼375 °C as evidenced by thermogravimetric analysis coupled mass spectroscopy. The Ni2+ ions order ferromagnetically below Tc = 5.1 K and anisotropic exchange interactions lead to a field-induced metamagnetic transition and spin-glass-like dependence on cooling conditions in magnetic field.

Thermogravimetric analysis

Thermal Stability

10.1039/c2tc00428c

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Light sources for high-volume manufacturing EUV lithography: technology, performance, and power scaling

nano Online (2018)

Igor V. Fomenkov David Brandt Alex I. Ershov A. A. Schafgans Yezheng Tao

Extreme Ultraviolet Lithography

10.1515/nano.0069.00001

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Quasispin Glass in a Geometrically Frustrated Magnet

Physical Review Letters (2013)

A. D. LaForge Sergio H. Pulido R. J. Cava Benny C. Chan A. P. Ramirez

The spin glass state in the spinel ZnCr(2(1-x))Ga(2x)O(4) is studied with magnetization and specific heat for x < 0.05. The freezing temperature is independent of disorder, despite a two-level-like density of states that varies linearly with x. This relationship implies the energy scale for freezing is independent of disorder, in contrast to mean field theories of spin glass. We suggest that the degrees of freedom are shielded spin vacancies, quasispins, which interact via an emergent long-range force mediated by the frustrated spin background.

Specific heat

10.1103/physrevlett.110.017203

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Citations (38)

Industrialization of a robust EUV source for high-volume manufacturing and power scaling beyond 250W

Igor V. Fomenkov A. A. Schafgans Yezheng Tao Robert J. Rafac Michael Purvis

In this paper, we provide an overview of various technologies for scaling tin laser-produced-plasma (LPP) extremeultraviolet (EUV) source performance to enable high volume manufacturing (HVM). We will show improvements to source architecture that facilitated the increase of EUV power from 100W to 250W, and the technical challenges for power scaling of key source parameters and subsystems. The performance of critical subsystems such as the Droplet Generator and Collector protection will be shown, with emphasis on stability and lifetime. Finally, we will describe current research activities and provide a perspective for LPP EUV sources towards 500W.

Extreme Ultraviolet Lithography

10.1117/12.2305955

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Citations (30)

Dynamic investigations of multiferroics: Terahertz and beyond

Journal of Physics Conference Series (2009)

Diyar Talbayev A. D. LaForge N. Hur T. Kimura S. A. Trugman

We overview our recent studies of the electrodynamic response of multiferroic compounds. We report results of magnetic dynamics in multiferroic hexagonal manganite HoMnO3 by far-infrared spectroscopy in a magnetic field. Our results provide insight into the ferromagnetic nature of the rare-earth/Mn exchange that enables the electric-field control of magnetism in HoMnO3. In the multiferroic Ba0.6Sr1.4Zn2Fe12O22 we have observed a magnetic resonance using time domain pump-probe reflectance spectroscopy revealing the importance of the dynamic magnetoelectric effect which is a modulation of the dielectric tensor by magnetization precession. Our results highlight that magneto-electric dynamics manifest from the far-infrared through the visible and that both time-integrated and time-resolved spectroscopy are important tools in elucidating the microscopic properties of multiferroics.

10.1088/1742-6596/148/1/012037

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Disparities in the Josephson vortex state electrodynamics of high-Tc cuprates

arXiv (Cornell University) (2007)

A. D. LaForge Willie J. Padilla Kenneth S. Burch Z. Q. Li S. V. Dordevic

We report on far infrared measurements of interplane conductivity for underdoped single-crystal YBa2Cu3Oy in magnetic field and situate these new data within earlier work on two other high-Tc cuprate superconductors, La(2-x)SrxCuO4 and Bi2Sr2CaCu2O(8+d). The three systems have displayed apparently disparate electrodynamic responses in the Josephson vortex state formed when magnetic field H is applied parallel to the CuO2 planes. Specifically, there is discrepancy in the number and field dependence of longitudinal modes observed. We compare and contrast these findings with several models of the electrodynamics in the vortex state and suggest that most differences can be reconciled through considerations of the Josephson vortex lattice ground state as well as the c-axis and in-plane quasiparticle dissipations.

Vortex state

Lattice (music)

10.48550/arxiv.0705.0045

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Magnetic Exchange Interaction between Rare-Earth and Mn Ions in Multiferroic Hexagonal Manganites

Physical Review Letters (2008)

Diyar Talbayev A. D. LaForge S. A. Trugman N. Hur Antoinette J. Taylor

We report a study of magnetic dynamics in multiferroic hexagonal manganite HoMnO3 by far-infrared spectroscopy. The low-temperature magnetic excitation spectrum of HoMnO3 consists of magnetic-dipole transitions of Ho ions within the crystal-field split J = 8 manifold and of the triangular antiferromagnetic resonance of Mn ions. We determine the effective spin Hamiltonian for the Ho ion ground state. The magnetic-field splitting of the Mn antiferromagnetic resonance allows us to measure the magnetic exchange coupling between the rare-earth and Mn ions.

Exchange interaction

10.1103/physrevlett.101.247601

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Citations (37)