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1. |
Record Nr. |
UNINA9910795559603321 |
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Autore |
Chen Ying-Jiun |
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Titolo |
Confined magnon modes and anisotropic exchange interaction in ultrathin Co films / / vorgelegt von Ying-Jiun Chen |
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Berlin : , : Logos Verlag, , [2017] |
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©2017 |
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ISBN |
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Descrizione fisica |
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1 online resource (128 pages) |
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Livello bibliografico |
Monografia |
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Note generali |
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PublicationDate: 20170418 |
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Sommario/riassunto |
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Long description: A fundamental need in wireless communication and modern computer processors is to fabricate faster, smaller, and lower power-consumption circuits. A promising approach is the utilization of spin waves, or rather, magnons in ferromagnetic films. Quantum confinement in ultra-thin films permits the coexistence of several exchange-dominated magnon modes with terahertz-range frequencies and sub-nanometer length scales. By means of spin-polarized electron energy loss spectroscopy (SPEELS), these exchange-dominated terahertz magnons are directly probed in ultra-thin cobalt films on Ir(001), Cu(001) and Pt(111) single crystal surfaces. The dispersion relation of the quantized magnon modes depends particularly on the interatomic exchange interaction in individual layers. By tuning the exchange interaction, modes with opposite group velocities, and thus an opposite propagation direction of the wave packets, can be generated. Ab initio theoretical calculations as well as an analytical Heisenberg model reveal a spatial localization of the modes at the surface, interior, and interface of the film that opens an experimental access to the layer-dependent magnetic properties. In itinerant ferromagnets like cobalt the magnetic properties depend sensitively on many-body correlation effects in the electronic structure. Here, it is |
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shown for the first time that spin-dependent correlations lead to a pronounced renormalization of the energy of the highest magnon mode by up to 260 meV, explaining the significant overestimation of theoretically predicted magnon energies and interatomic exchange interaction found in literature. |
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2. |
Record Nr. |
UNIORUON00311683 |
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Autore |
BURLACKIJ, Fedor |
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Titolo |
Mao Cze-Dun : "Nas koronnyj nomer - eto vojna, diktatura..." / Fedor Burlackij |
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Moskva, : Izdatel'stvo "Mezdunarodnye otnosenija", 1976 |
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Descrizione fisica |
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Materiale a stampa |
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Livello bibliografico |
Monografia |
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3. |
Record Nr. |
UNINA9910220140403321 |
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Autore |
Gonzalez Gabriella |
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Titolo |
Energy-sector workforce development in West Virginia : aligning community college education and training with needed skills |
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Pubbl/distr/stampa |
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RAND Corporation, 2015 |
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[Place of publication not identified], : Rand Corporation, 2015 |
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ISBN |
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Descrizione fisica |
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Collana |
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[Research report] Energy-sector workforce development in West Virginia |
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Soggetti |
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Energy industries - Supply and demand - Employees - West Virginia |
Energy industries - Employees - Training of - West Virginia |
Community college graduates - Supply and demand - West Virginia |
Skilled labor - Supply and demand - West Virginia |
Labor supply - Effect of education on - West Virginia |
Vocational education - West Virginia |
Occupational training - West Virginia |
Labor & Workers' Economics |
Business & Economics |
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Lingua di pubblicazione |
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Livello bibliografico |
Monografia |
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Note generali |
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Bibliographic Level Mode of Issuance: Monograph |
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"In the past, West Virginia's energy sector was primarily based on mining and combusting coal for industry or electricity. In recent years, the production and industrial application of natural gas and natural gas liquids from shale resources have increased demand for workers in the energy sector. In 2013, the National Energy Technology Laboratory (NETL) asked RAND to work closely with the Community and Technical College System of West Virginia (CTCS) to develop a strategy for energy-sector employers and education and training institutions to collaborate to ensure that the local talent pool is prepared to enter the workforce with the competencies to fill energy-sector jobs now and in |
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the future. To develop that strategy we examined data from the Occupational Information Network (O*NET) and interviewed energy-sector employers in West Virginia to determine the key knowledge areas, skills, and abilities required of energy-sector employees across the country and within West Virginia. We then analyzed data from the West Virginia Higher Education Policy Commission, interviews with representatives of academic and training providers within CTCS, apprenticeship programs, a regional Workforce Investment Board (WIB), and CTCS students enrolled in energy-related programs to determine whether education and training is aligned with the sector's needs and what may impede such alignment. We conducted a national review of promising practices from training provider-employer partnerships across the United States. Based on this analysis, we developed ten recommended action items CTCS and other regional stakeholders can implement to support a well-aligned and coherent energy-sector workforce-development pipeline."--Back cover. |
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