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</o:shapelayout></xml><![endif]--></head><body lang=SL link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Vabimo vas na 6. predavanje iz sklopa "Kolokviji na IJS" v letu 2015/16, ki bo <b><span style='color:red'>v sredo, 02. decembra 2015, ob 13. uri </span></b><span style='color:red'>v Veliki predavalnici Instituta »Jožef Stefan«</span> na Jamovi cesti 39 v Ljubljani. Napovednik predavanja najdete tudi na naslovu <a href="http://www.ijs.si/ijsw/Koledar_prireditev">http://www.ijs.si/ijsw/Koledar_prireditev</a>, posnetke preteklih predavanj<span style='color:blue'> </span>pa na <a href="http://videolectures.net/kolokviji_ijs">http://videolectures.net/kolokviji_ijs</a>. <o:p></o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<o:p></o:p></p><p class=MsoNormal><b><span lang=EN-GB style='mso-fareast-language:ZH-CN'>prof. dr. J. M. D. Coey<o:p></o:p></span></b></p><p class=MsoNormal><i><span lang=EN-GB style='mso-fareast-language:ZH-CN'>CRANN in School of Physics, Trinity College, Dublin, Irska<o:p></o:p></span></i></p><p class=MsoNormal><b><span style='font-size:14.0pt'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:14.0pt'><o:p> </o:p></span></b></p><p class=MsoNormal align=center style='text-align:center'><b><span lang=EN-GB style='font-size:14.0pt;font-family:"Cambria","serif";mso-fareast-language:EN-GB'>Polkovina brez magnetnega momenta: kako lahko spremeni spintroniko?<o:p></o:p></span></b></p><p class=MsoNormal style='text-align:justify'><span style='font-size:11.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;text-align:justify'><span lang=EN-GB style='font-size:11.0pt;font-family:"Cambria","serif";mso-fareast-language:EN-GB'>Polkovina je snov, v kateri imajo stanja elektronov z eno vrsto spinov (“gor” ali “dol”) kovinski značaj, stanja elektronov z nasprotnim spinom pa izolatorski oz. polprevodniški značaj. Prve odlikuje končna gostota stanj na Fermijev nivoju, druge pa t.i. energijska reža. Razlika med številoma elektronov z enim in drugim spinom, torej med številoma ustreznih elektronskih stanj do Fermijevega nivoja, določa magnetni moment materiala na enoto kemijske formule. V primeru stehiometrične zlitine je le-ta celoštevilski večkratnik Bohrovega magnetona in sicer 4, 3, 2, 1 ali 0. Posebej zanimiv je primer, ko so posamezni magnetni momenti sicer urejeni, a je njihova vsota enaka nič kot v primeru antiferomagneta. Za razliko od slednjega ga odlikujeta neenakovredni magnetni podmreži in stoodstotna spinska polarizacija na Fermijevem nivoju. Zaradi tega se ne bodo ustvarjala t.i. stresana polja, material pa bo neobčutljiv na zunanje magnetne motnje. Čeprav je de Groot tako snov napovedal že pred 25 leti, je bila eksperimentalno odkrita šele nedavno v Mn2Ru0.5Ga (MRG). Najprej bomo predstavili pripravo in lastnosti tankih plasti te kubične Heuslerjeve zlitine, zatem pa bomo obravnavali njen potencialni vpliv na magnetne tunelske stike, magnetni spomin in ultravisokofrekvenčne oscilatorje na spinski navor. Slednji utegnejo služiti za izdelavo spintronskih oscilatorjev, ki bodo premostili tera-herčno (THz) vrzel ter tako zagotovili prihodnost za računalniško revolucijo prihodnje generacije.<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;text-align:justify'>Predavanje bo v angleščini.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><b><span style='font-family:"Calibri","sans-serif";color:red'>Lepo vabljeni!</span></b><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><span style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:SL'><br clear=all style='page-break-before:always'></span><p class=MsoNormal><span style='color:black'>We invite you to the 6th Institute colloquium in the academic year 2015/16. The colloquium will be held <b>on Wednesday December 02, 2015 at 1 PM</b> in <b>the main Institute</b></span><b><span style='color:#1F497D'> </span><span style='color:black'>lecture hall</span></b><span style='color:black'>, Jamova 39, Ljubljana. To read the abstract click </span><span style='color:#1F497D'><a href="http://www.ijs.si/ijsw/Koledar_prireditev">http://www.ijs.si/ijsw/Koledar_prireditev</a>. </span><span style='color:black'>Past colloquia are posted on</span><span style='color:#1F497D'> <a href="http://videolectures.net/kolokviji_ijs">http://videolectures.net/kolokviji_ijs</a>.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='margin-bottom:12.0pt'>********************************************<b><o:p></o:p></b></p><p class=MsoNormal><b><span lang=EN-GB>prof. dr. J. M. D. Coey<o:p></o:p></span></b></p><p class=MsoNormal><i><span lang=EN-GB>CRANN and School of Physics, Trinity College, Dublin, Ireland<o:p></o:p></span></i></p><p class=MsoNormal><b><span style='font-size:16.0pt;mso-fareast-language:ZH-CN'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:16.0pt;mso-fareast-language:ZH-CN'><o:p> </o:p></span></b></p><p class=MsoNormal align=center style='text-align:center'><b><span lang=EN-GB style='font-size:14.0pt;font-family:"Cambria","serif";mso-fareast-language:EN-GB'>The zero-moment half metal: How can it change spintronics?<o:p></o:p></span></b></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Cambria","serif";mso-fareast-language:EN-GB'>A zero-moment half metal is a ferromagnetic metal with a gap in the density of states at the Fermi level for either the spin-up or spin-down electrons. Such a material, if stoichiometric, should have a spin moment which is an integral number of Bohr magnetons per formula unit, 4, 3, 2, 1, or 0. The zero-moment case is particularly intriguing. The material will be magnetically ordered with no net moment (like an antiferromagnet) but unlike an antiferromagnet the magnetic sublattices are inequivalent, and there is 100% spin polarization at the Fermi level. It creates no stray field, and is insensitive to external field. Although predicted by de Groot 25 years ago, data on the first experimental realization, Mn2Ru0.5Ga (MRG), was only published recently. The preparation and properties of thin films of this cubic Heusler alloy will first be presented, and then its potential impact on perpendicular magnetic tunnel junctions, magnetic memory and ultra-high-frequency spin torque oscillators will be discussed. For the last application, there is a prospect of creating on-chip spintronic oscillators that can breach the THz gap, and assure the future of the big data revolution for the next generation.<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Cordially invited!<o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p></div></body></html>