<html><body><div style="font-family: times new roman, new york, times, serif; font-size: 12pt; color: #000000"><div><span style="font-family: Helvetica, Arial, sans-serif; font-size: 12pt;"></span></div><div style="color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><div style="font-family: times new roman, new york, times, serif; font-size: 12pt; color: #000000"><div style="color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><div style="font-family: times new roman, new york, times, serif; font-size: 12pt; color: #000000"><div>Cijenjeni kolege, šaljem vam ispravljeni poziv na seminar (ime predavača, zaglavlje starog seminara...). Ispričavam se zbog nepažnje prilikom pisanja.</div><div><br></div><div>Damir Starešinić</div><div><br></div><div><br></div><div style="FONT-SIZE: 12pt; TEXT-DECORATION: none; FONT-FAMILY: Helvetica,Arial,sans-serif; FONT-WEIGHT: normal; COLOR: #000; FONT-STYLE: normal"><div style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif; COLOR: #000000"><div style="FONT-SIZE: 12pt; TEXT-DECORATION: none; FONT-FAMILY: Helvetica,Arial,sans-serif; FONT-WEIGHT: normal; COLOR: #000; FONT-STYLE: normal"><div style="FONT-SIZE: 12pt; FONT-FAMILY: arial,helvetica,sans-serif; COLOR: #000000"><div style="FONT-SIZE: 12pt; TEXT-DECORATION: none; FONT-FAMILY: Helvetica,Arial,sans-serif; FONT-WEIGHT: normal; COLOR: #000; FONT-STYLE: normal"><div style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif; COLOR: #000000"><div style="FONT-SIZE: 12pt; TEXT-DECORATION: none; FONT-FAMILY: Helvetica,Arial,sans-serif; FONT-WEIGHT: normal; COLOR: #000; FONT-STYLE: normal"><div style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif; COLOR: #000000"><div style="FONT-SIZE: 12pt; TEXT-DECORATION: none; FONT-FAMILY: Helvetica,Arial,sans-serif; FONT-WEIGHT: normal; COLOR: #000; FONT-STYLE: normal"><div style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif; COLOR: #000000"><div style="FONT-SIZE: 12pt; TEXT-DECORATION: none; FONT-FAMILY: Helvetica,Arial,sans-serif; FONT-WEIGHT: normal; COLOR: #000; FONT-STYLE: normal"><div style="FONT-SIZE: 12pt; FONT-FAMILY: arial,helvetica,sans-serif; COLOR: #000000"><div style="FONT-SIZE: 12pt; TEXT-DECORATION: none; FONT-FAMILY: Helvetica,Arial,sans-serif; FONT-WEIGHT: normal; COLOR: #000; FONT-STYLE: normal"><div style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif; COLOR: #000000"><div style="TEXT-ALIGN: center"><strong><b><span lang="HR" style="FONT-SIZE: 16pt; COLOR: black"><img><img src="cid:fb559ca8379da07816ebeb024a88bd13dae62179@zimbra"></span></b></strong></div><div style="TEXT-ALIGN: center"><p style="TEXT-ALIGN: center; MARGIN: 0px" align="center"><b><span lang="EN-GB" style="FONT-FAMILY: 'Century Gothic',sans-serif; COLOR: #5f5f5f">Institut za fiziku, Bijenička cesta 46,</span></b></p><p style="TEXT-ALIGN: center; MARGIN: 0px" align="center"><b><span lang="EN-GB" style="FONT-FAMILY: 'Century Gothic',sans-serif; COLOR: #5f5f5f">predavaonica u zgradi Mladen Paić</span></b></p><strong><b><span lang="EN-GB" style="FONT-SIZE: 14pt; FONT-FAMILY: 'Century Gothic',sans-serif; COLOR: #993300">četvrtak, 22. listopada 2015., u 15:00 sati</span></b><br></strong></div><div style="TEXT-ALIGN: center"><strong></strong> </div><div style="TEXT-ALIGN: center"><span lang="EN-GB" style="FONT-SIZE: 16pt; FONT-FAMILY: 'Times New Roman',serif; COLOR: #55913c"><span lang="EN-GB" style="FONT-SIZE: 16pt; FONT-FAMILY: 'Times New Roman',serif; COLOR: #55913c"><strong>From the discovery to the control of THz spin currents: towards ultrafast spintronics<br></strong></span></span></div><div style="TEXT-ALIGN: center"><b><span lang="EN-GB" style="FONT-SIZE: 14pt; FONT-FAMILY: 'Century Gothic',sans-serif">Dr. Marco Battiato<br></span></b></div><div style="TEXT-ALIGN: center"><b></b> </div><div style="TEXT-ALIGN: center"><b><b><b><span lang="EN-GB" style="FONT-SIZE: 11pt; FONT-FAMILY: 'Century Gothic',sans-serif">Vienna University of Technology, Austria</span></b></b></b><b><b><span lang="EN-GB" style="FONT-SIZE: 11pt; FONT-FAMILY: 'Century Gothic',sans-serif"> </span></b></b></div><div style="TEXT-ALIGN: center"><span style="FONT-SIZE: small; FONT-FAMILY: Arial"></span><br> </div><div style="TEXT-ALIGN: left"><p style="margin: 0px;"><span style="font-family: arial, helvetica, sans-serif;">The debate over the origin of the ultrafast demagnetization [1] has been intensively active for the past 20 years. Several microscopic mechanisms have been proposed but none has managed so far to provide direct and incontrovertible evidences of their validity. In this context we have proposed an approach based on spin dependent electron diffusion as the driver of the ultrafast demagnetization. [2]</span></p><p style="margin: 0px;"><span style="font-family: arial, helvetica, sans-serif;">Recent experimental findings have revolutionized the field by confirming the existence of spin superdiffusion. We have shown that 1) spin diffusing away from a layer undergoing ultrafast demagnetization can be used to create an <span style="text-decoration: underline;">ultrafast increase of magnetization</span> [3] in a neighboring magnetic layer, 2) optical excitation is not a prerequisite for the ultrafast demagnetization [4] and that spin unpolarised electrons superdiffusing into a ferromagnetic layer can trigger ultrafast demagnetisation, and 3) superdiffusive spin currents can be tailored by appropriate choice of materials and used to produce broadband THz emission via the inverse spin Hall effect. [5]</span></p><p style="margin: 0px;"><span style="font-family: arial, helvetica, sans-serif;">The impact of these new discoveries goes beyond the solution of the mystery of ultrafast demagnetization. It shows how spin information can be, not only manipulated, as shown initially, but most importantly transported at unprecedented speeds. This new discovery lays the basis for femtosecond spintronics.</span></p><p style="margin: 0px;"><span style="font-family: arial, helvetica, sans-serif;"><br></span></p><p style="margin: 0px;"><span style="font-family: arial, helvetica, sans-serif;">[1] E. Beaurepaire, J.-C. Merle, A. Daunois, J.-Y. Bigot, Phys. Rev. Lett., 76, 4250 (1996).</span><br><span style="font-family: arial, helvetica, sans-serif;">[2] M. Battiato, K. Carva, P.M. Oppeneer, Phys Rev. Lett. 105, 027203 (2010).</span><br><span style="font-family: arial, helvetica, sans-serif;">[3] D. Rudolf,* C. La-O-Vorakiat,* M. Battiato,* R. Adam, J. M. Shaw, E. Turgut, P. Maldonado, S. Mathias, P. Grychtol, H. T. Nembach, T. J. Silva, M. Aeschlimann, H. C. Kapteyn, M. M. Murnane, C. M. Schneider, and P. M. Oppeneer, Nature Comm. 3, 1037 (2012).</span><br><span style="font-family: arial, helvetica, sans-serif;">[4] A. Eschenlohr,* M. Battiato,* P. Maldonado, N. Pontius, T. Kachel, K. Holldack, R. Mitzner, A. Föhlisch, P. M. Oppeneer, and C. Stamm, Nature Mater. 12, 332 (2013).</span><br><span style="font-family: arial, helvetica, sans-serif;">[5] T. Kampfrath, M. Battiato, P. Maldonado, G. Eilers, J. Nötzold, I. Radu, F. Freimuth, Y. Mokrousov, S. Blügel, M. Wolf, P. M. Oppeneer, and M. Münzenberg, Nature Nanotechnol. 8, 256 (2013).</span></p><p style="margin: 0px;"><span style="font-family: arial, helvetica, sans-serif;"><br></span></p><p style="TEXT-ALIGN: left; MARGIN: 0px; LINE-HEIGHT: 115%"><span style="FONT-FAMILY: arial,helvetica,sans-serif"></span> </p></div><div style="TEXT-ALIGN: left"><b><span lang="EN-GB" style="FONT-SIZE: 12pt; FONT-FAMILY: 'Century Gothic',sans-serif"><b><span lang="EN-GB" style="FONT-SIZE: 11pt; FONT-FAMILY: 'Century Gothic',sans-serif"> </span></b></span></b></div><div style="TEXT-ALIGN: right"><b><span lang="EN-GB" style="FONT-SIZE: 12pt; FONT-FAMILY: 'Century Gothic',sans-serif"><b><span lang="EN-GB" style="FONT-SIZE: 11pt; FONT-FAMILY: 'Century Gothic',sans-serif">Voditelji seminara IF-a: <a href="mailto:natasav@ifs.hr" target="_blank">Nataša Vujičić</a> i <a href="mailto:damirs@ifs.hr" target="_blank">Damir Starešinić</a></span></b></span></b><br></div></div></div></div></div><div> </div></div></div></div></div></div></div></div></div></div></div><br></div><br></div><br></div></div><div><br></div></div></body></html>