BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:America/New_York BEGIN:DAYLIGHT DTSTART:20250309T030000 TZOFFSETFROM:-0500 TZOFFSETTO:-0400 RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3 TZNAME:EDT END:DAYLIGHT BEGIN:STANDARD DTSTART:20251102T010000 TZOFFSETFROM:-0400 TZOFFSETTO:-0500 RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11 TZNAME:EST END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20250621T170025Z UID:515BC7F4-0995-4071-BA0D-9111A28BC1AE DTSTART;TZID=America/New_York:20250619T183000 DTEND;TZID=America/New_York:20250619T203200 DESCRIPTION:Antennas are the quintessential communication devices used to t ransmit and receive information encoded in electromagnetic waves. Their de bilitating shortcoming is that they are resistant to miniaturization becau se their gain and efficiency plummet when they are shrunk to dimensions mu ch smaller than the wavelength of the electromagnetic wave. The radiation efficiency\, for instance\, is limited to ~\, A (radiating area)/ (lambda) E2 where A is the radiating area of the antenna and l is the wavelength th at is radiated. This is known as the Harrington limit.\n\nWe have recently invented and demonstrated a new genre of antennas that leverages magnetiz ation precession or spin waves\, induced in periodic arrays of nanomagnets by various types of external stimuli\, to radiate electromagnetic waves i n space. These unconventional antennas sport gain and intrinsic radiation efficiencies which can exceed the Harrington limit by as much as five orde rs of magnitude. We have investigated and demonstrated a large family of s uch antennas employing different systems such as multiferroic magnonic cry stals\, the spin Hall effect and topological insulators. These antennas ha ve dimensions 3-4 orders of magnitude smaller than the wavelength\, making antenna miniaturization possible. They can have embedded applications suc h as in medically implanted devices for acute care\, stealth devices for d efense and crime-fighting\, and on-chip communication.\n\nThere are additi onal unusual features that these antennas exhibit. Despite being “point sources” that are much smaller than the wavelength\, these antennas do n ot radiate isotropically like a point source\, but instead exhibit an anis otropic radiation pattern because of the inherent anisotropy of the spin w aves that are the source of the electromagnetic radiation. One can steer t he principal lobe of the radiated beam by manipulating the external stimul i\, which enables active electronic scanning (AESA) without requiring a ph ased array. This talk will describe this new genre of nano-antennas.\n\nCo -sponsored by: Electron Devices Society (ED15) - Northern Va Chapter\n\nSp eaker(s): Prof.Supriyo Bandyopadhyay\, \n\nAgenda: \nIntroduction of speak er - 6:30 pm\n\nPresentation - 6:35 pm\n\nQ&A - 7:30 pm\n\nVirtual: https: //events.vtools.ieee.org/m/484353 LOCATION:Virtual: https://events.vtools.ieee.org/m/484353 ORGANIZER:fsemendy@ieee.org SEQUENCE:8 SUMMARY:Spintronic Nano-Antennas URL;VALUE=URI:https://events.vtools.ieee.org/m/484353 X-ALT-DESC:Description: <br /><p class="MsoNormal" style="margin-bottom: 0i n\; line-height: 115%\;"><span style="font-family: 'Times New Roman'\,seri f\;">Antennas are the quintessential communication devices used to transmi t and receive information encoded in electromagnetic waves. Their debilita ting shortcoming is that they are resistant to miniaturization because the ir gain and efficiency plummet when they are shrunk to dimensions much sma ller than the wavelength of the electromagnetic wave. The radiation effici ency\, for instance\, is limited to ~<span style="position: relative\; top : 5.0pt\; mso-text-raise: -5.0pt\;"><!-- [if gte vml 1]><v:shapetype\n id= "_x0000_t75" coordsize="21600\,21600" o:spt="75" o:preferrelative="t"\n pa th="m@4@5l@4@11@9@11@9@5xe" filled="f" stroked="f">\n <v:stroke joinstyle= "miter"/>\n <v:formulas>\n <v:f eqn="if lineDrawn pixelLineWidth 0"/>\n <v:f eqn="sum @0 1 0"/>\n <v:f eqn="sum 0 0 @1"/>\n <v:f eqn="prod @2 1 2"/>\n <v:f eqn="prod @3 21600 pixelWidth"/>\n <v:f eqn="prod @3 21600 p ixelHeight"/>\n <v:f eqn="sum @0 0 1"/>\n <v:f eqn="prod @6 1 2"/>\n <v :f eqn="prod @7 21600 pixelWidth"/>\n <v:f eqn="sum @8 21600 0"/>\n <v:f eqn="prod @7 21600 pixelHeight"/>\n <v:f eqn="sum @10 21600 0"/>\n </v:f ormulas>\n <v:path o:extrusionok="f" gradientshapeok="t" o:connecttype="re ct"/>\n <o:lock v:ext="edit" aspectratio="t"/>\n</v:shapetype><v:shape id= "_x0000_i1025" type="#_x0000_t75" style='width:29.25pt\;\n height:18pt' o: ole="">\n <v:imagedata src="file:///C:/Users/fseme/AppData/Local/Temp/msoh tmlclip1/01/clip_image001.wmz"\n o:title=""/>\n</v:shape><![endif]--><!-- [if !vml]--><!--[endif]--></span><!-- [if gte mso 9]><xml>\n <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1025"\n DrawAspect ="Content" ObjectID="_1808146177">\n </o:OLEObject>\n</xml><![endif]-->\, A (radiating area)/ (lambda)E2 where&nbsp\;<em>A</em> is the radiating are a of the antenna and </span><em><span style="font-family: Symbol\; mso-bid i-font-family: 'Times New Roman'\;">l</span></em><span style="font-family: 'Times New Roman'\,serif\;"> is the wavelength that is radiated. This is known as the <em>Harrington limit</em>. </span></p>\n<p class="MsoNormal" style="margin-bottom: 0in\; line-height: 115%\;"><span style="font-family: 'Times New Roman'\,serif\;">&nbsp\;</span></p>\n<p class="MsoNormal" styl e="margin-bottom: 0in\; line-height: 115%\;"><span style="font-family: 'Ti mes New Roman'\,serif\;">We have recently invented and demonstrated a new genre of antennas that leverages magnetization precession or spin waves\, induced in periodic arrays of nanomagnets by various types of external sti muli\, to radiate electromagnetic waves in space. These unconventional ant ennas sport gain and intrinsic radiation efficiencies which can exceed the Harrington limit by as much as five orders of magnitude. We have investig ated and demonstrated a large family of such antennas employing different systems such as multiferroic magnonic crystals\, the spin Hall effect and topological insulators. These antennas have dimensions 3-4 orders of magni tude smaller than the wavelength\, making antenna miniaturization possible . They can have embedded applications such as in medically implanted devic es for acute care\, stealth devices for defense and crime-fighting\, and o n-chip communication.</span></p>\n<p class="MsoNormal" style="line-height: 115%\; margin: 12.0pt 0in 0in 0in\;"><span style="font-family: 'Times New Roman'\,serif\;">There are additional unusual features that these antenna s exhibit. Despite being &ldquo\;point sources&rdquo\; that are<span style ="mso-spacerun: yes\;">&nbsp\; </span>much smaller than the wavelength\, t hese antennas do not radiate isotropically like a point source\, but inste ad exhibit an anisotropic radiation pattern because of the inherent anisot ropy of the spin waves that are the source of the electromagnetic radiatio n. One can steer the principal lobe of the radiated beam by manipulating t he external stimuli\, which enables active electronic scanning (AESA) with out requiring a phased array. This talk will describe this new genre of na no-antennas.</span></p>\n<p class="MsoNormal" style="line-height: 115%\; m argin: 12.0pt 0in 0in 0in\;"><span style="font-family: 'Times New Roman'\, serif\;">&nbsp\;</span></p><br /><br />Agenda: <br /><p>Introduction of sp eaker - 6:30 pm</p>\n<p>Presentation - 6:35 pm</p>\n<p>Q&amp\;A - 7:30 pm& nbsp\;</p> END:VEVENT END:VCALENDAR