BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:Europe/Rome BEGIN:DAYLIGHT DTSTART:20230326T030000 TZOFFSETFROM:+0100 TZOFFSETTO:+0200 RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3 TZNAME:CEST END:DAYLIGHT BEGIN:STANDARD DTSTART:20231029T020000 TZOFFSETFROM:+0200 TZOFFSETTO:+0100 RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10 TZNAME:CET END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20231012T062338Z UID:A9EA5F93-B95D-4B6E-AD3E-5561B725C547 DTSTART;TZID=Europe/Rome:20231006T121500 DTEND;TZID=Europe/Rome:20231008T130000 DESCRIPTION:We previously proposed ferroelectric data storage that uses sca nning nonlinear dielectric microscopy (SNDM)\, called SNDM probe memory\, as a next-generation ultrahigh-density information recording method. We co nfirmed an extremely high recording density and high-speed writing using L iTaO3 single crystal media [1][2].\n\nHowever\, since reading is based on the detection of very small nonlinear dielectric constants of ferroelectri c materials using SNDM technique\, slow playback speed (actually 2Mbps) hi nders the practical use of SNDM probe memory [3].\n\nTo solve this problem \, a material with a large nonlinear dielectric constant is required. Our basic experiments revealed that a nonlinear dielectric constant has an ext remely large temperature dependence and is proportional to (T0-T)-3.5\, wh ere T is the medium temperature and T0 is the Curie temperature[4]. This m eans that an increase in the nonlinear dielectric constant\, which would e nable ultrahigh-speed reading (Gbps or faster)\, can be easily obtained ev en in LiTaO3 crystal by making T close to T0. However\, simply increasing the medium temperature closer to the Curie temperature under thermal equil ibrium degrades the polarization retention characteristics.\n\nTherefore\, we propose a heat-assisted ferroelectric reading (HAFeR) method that incr eases the reading speed while maintaining the polarization retention chara cteristics. This is achieved by locally heating the medium for a very shor t time at the data reading position using laser pulse irradiation. We cond ucted a basic experiment and confirmed that laser pulse irradiation increa sed the SNDM signal strength much more.\n\nWe also discuss the relationshi p between the maximum number of laser irradiation pulses and the optical p ulse width for a medium heated to 550 °C (equivalent to a reading speed o f 5 Gbps).\n\nThe proposed method overcomes the fundamental problems of ne xt-generation ultrahigh-density ferroelectric data storage.\n\nReferences: \n\n[1] Kenkou Tanaka and Yasuo Cho\, ”Actual information storage with a recording density of 4 Tbit/in.2 in a ferroelectric recording medium”\, Appl. Phys. Lett\,Vol.97\, 092901 (2010) .\n\n[2] Kenkou TANAKA\, Yuichi KURIHASHI\, Tomoya UDA\, Yasuhiro DAIMON\, Nozomi ODAGAWA\, Ryusuke HIROSE \, Yoshiomi HIRANAGA\, and Yasuo CHO:“Scanning Nonlinear Dielectric Micr oscopy Nano-Science and Technology for Next Generation High Density Ferroe lectric Data Storage”\, Jpn. J. Appl. Phys\, Vol.47\, 3311 (2008).\n\n[3 ] Yoshiomi Hiranaga\, Tomoya Uda\, Y. Kurihashi\, H. Tochishita\, M. Kadot a and Y. Cho\, “Nanodomain Formation on Ferroelectrics and Development o f Hard-Disk-Drive-Type Ferroelectric Data Storage Devices”\, Jpn.J.Appl. Phys. Vol.48\, 09KA18 (2009).\n\n[4] Yoshiomi Hiranaga and Yauo Cho\, “ Material Design Strategy for Enhancement of Readback Signal Intensity in F erroelectric Probe Data Storage”\, IEEE Trans. Ultrason. Ferroelectr. Fr eq. Control\, Vol.68\, 859 (2021).\n\nCo-sponsored by: Dr. Iaroslav Gapone nko\, University of Geneva \n\nSpeaker(s): \, Prof. Yasuo CHO\n\nRoom: Au ditoire Stueckelberg \, Bldg: Ecole de Physique\, Université de Genève \, Quai Ernest-Ansermet\, 24 \, Geneve\, Switzerland \, Geneva\, Switzerla nd\, Switzerland\, 1211 LOCATION:Room: Auditoire Stueckelberg \, Bldg: Ecole de Physique\, Univer sité de Genève \, Quai Ernest-Ansermet\, 24 \, Geneve\, Switzerland \, G eneva\, Switzerland\, Switzerland\, 1211 ORGANIZER:carmine.senatore@unige.ch SEQUENCE:11 SUMMARY:Heat Assisted Ferroelectric Reading for High Speed Ferroelectric Pr obe Data Storage URL;VALUE=URI:https://events.vtools.ieee.org/m/375529 X-ALT-DESC:Description: <br /><p class="x_x_MsoNormal"><span lang="EN-US">W e previously proposed ferroelectric data storage that uses scanning nonlin ear dielectric microscopy (SNDM)\, called SNDM probe memory\, as a next-ge neration ultrahigh-density information recording method. </span><span lang ="DE-CH">We confirmed an extremely high recording density and high-speed w riting using LiTaO<sub>3</sub> single crystal media [1][2].&nbsp\; </span> </p>\n<p class="x_x_MsoNormal"><span lang="DE-CH">However\, since reading is based on the detection of very small nonlinear dielectric constants of ferroelectric materials using SNDM technique\, slow playback speed (actual ly 2Mbps) hinders the practical use of SNDM probe memory [3].&nbsp\; </spa n></p>\n<p class="x_x_MsoNormal">To solve this problem\, a material with a large nonlinear dielectric constant is required. Our basic experiments re vealed that a nonlinear dielectric constant has an extremely large tempera ture dependence and is proportional to (T<sub>0</sub>-T)<sup>-3.5</sup>\, where T is the medium temperature and T<sub>0</sub> is the Curie temperatu re[4]. This means that an increase in the nonlinear dielectric constant\, which would enable ultrahigh-speed reading (Gbps or faster)\, can be easil y obtained even in LiTaO<sub>3</sub> crystal by making T close to T<sub>0< /sub>. However\, simply increasing the medium temperature closer to the Cu rie temperature under thermal equilibrium degrades the polarization retent ion characteristics.&nbsp\;</p>\n<p class="x_x_MsoNormal">Therefore\, we p ropose a heat-assisted ferroelectric reading (HAFeR) method that increases the reading speed while maintaining the polarization retention characteri stics. This is achieved by locally heating the medium for a very short tim e at the data reading position using laser pulse irradiation. We conducted a basic experiment and confirmed that laser pulse irradiation increased t he SNDM signal strength much more.&nbsp\;&nbsp\;</p>\n<p class="x_x_MsoNor mal">We also discuss the relationship between the maximum number of laser irradiation pulses and the optical pulse width for a medium heated to 550 &deg\;C (equivalent to a reading speed of 5 Gbps).</p>\n<p class="x_x_MsoN ormal">The proposed method overcomes the fundamental problems of next-gene ration ultrahigh-density ferroelectric data storage.</p>\n<p class="x_x_Ms oNormal" aria-hidden="true">&nbsp\;</p>\n<p class="x_x_MsoNormal">Referenc es:&nbsp\;&nbsp\;&nbsp\;</p>\n<p class="x_x_MsoNormal">[1] Kenkou Tanaka a nd Yasuo Cho\, &rdquo\;Actual information storage with a recording density of 4 Tbit/in.<sup>2</sup> in a ferroelectric recording medium&rdquo\;\, A ppl. Phys. Lett\,Vol.97\, 092901 (2010) .</p>\n<p class="x_x_MsoNormal">[2 ] Kenkou TANAKA\, Yuichi KURIHASHI\, Tomoya UDA\, Yasuhiro DAIMON\, Nozomi ODAGAWA\, Ryusuke HIROSE\, Yoshiomi HIRANAGA\, and Yasuo CHO:&ldquo\;Scan ning Nonlinear Dielectric Microscopy Nano-Science and Technology for Next Generation High Density Ferroelectric Data Storage&rdquo\;\, Jpn. J. Appl. Phys\, Vol.47\, 3311 (2008).</p>\n<p class="x_x_MsoNormal">[3] Yoshiomi H iranaga\, Tomoya Uda\, Y. Kurihashi\, H. Tochishita\, M. Kadota and Y. Cho \, &ldquo\;Nanodomain Formation on Ferroelectrics and Development of Hard- Disk-Drive-Type Ferroelectric Data Storage Devices&rdquo\;\, Jpn.J.Appl. P hys. Vol.48\, 09KA18 (2009).</p>\n<p class="x_x_MsoNormal">[4] Yoshiomi Hi ranaga and Yauo Cho\, &ldquo\;Material Design Strategy for Enhancement of Readback Signal Intensity in Ferroelectric Probe Data Storage&rdquo\;\, IE EE Trans. Ultrason. Ferroelectr. Freq. Control\, Vol.68\, 859 (2021).</p>\ n<p class="x_x_MsoNormal"><span lang="EN-US" style="font-size: 11.0pt\;">& nbsp\;</span></p>\n<p class="x_x_MsoNormal"><span lang="EN-US" style="font -size: 11.0pt\;">&nbsp\;</span></p> END:VEVENT END:VCALENDAR