{"id":47892,"date":"2025-05-13T14:20:21","date_gmt":"2025-05-13T08:50:21","guid":{"rendered":"https:\/\/vajiramandravi.com\/current-affairs\/?p=47892"},"modified":"2025-05-29T12:50:58","modified_gmt":"2025-05-29T07:20:58","slug":"ferroelectricity","status":"publish","type":"post","link":"https:\/\/vajiramandravi.com\/current-affairs\/ferroelectricity\/","title":{"rendered":"Ferroelectricity"},"content":{"rendered":"<h2>Ferroelectricity Latest News<\/h2>\n<p>Researchers at Oak Ridge National Laboratory (ORNL) have developed a breakthrough technique to visualise the dynamics of domain walls with unprecedented detail.<\/p>\n<h2>Fundamentals of Ferroelectricity<\/h2>\n<ul>\n<li><strong>Ferroelectricity<\/strong>\u00a0is a property of certain\u00a0<strong>non-conducting crystals<\/strong>\u00a0or\u00a0<strong>dielectrics<\/strong>\u00a0that exhibit\u00a0<strong>spontaneous electric polarisation<\/strong>, where the centres of\u00a0<strong>positive and negative charges separate<\/strong>, making one side of the crystal positive and the other negative.\n<ul>\n<li>This\u00a0<strong>electric polarisation<\/strong>\u00a0can be\u00a0<strong>reversed<\/strong>\u00a0by applying an appropriate\u00a0<strong>external electric field<\/strong>.<\/li>\n<\/ul>\n<\/li>\n<li>The term\u00a0<strong>ferroelectric<\/strong>\u00a0is derived from\u00a0<strong>ferromagnetism<\/strong>, where magnetic domains align spontaneously; similarly, in ferroelectrics,\u00a0<strong>electric dipoles align<\/strong>\u00a0spontaneously in domains.\n<ul>\n<li>Examples of\u00a0<strong>ferroelectric materials<\/strong>\u00a0include\u00a0<strong>barium titanate (BaTiO\u2083)<\/strong>\u00a0and\u00a0<strong>Rochelle salt<\/strong>.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Ferroelectric domains<\/strong>\u00a0are clusters where dipoles are aligned. These domains can be reoriented by strong electric fields.<\/li>\n<li>The delay in response when domains reorient is termed\u00a0<strong>ferroelectric hysteresis<\/strong>, analogous to\u00a0<strong>ferromagnetic hysteresis<\/strong>.<\/li>\n<li>Ferroelectricity vanishes above a critical temperature called the\u00a0<strong>Curie Temperature<\/strong>, where thermal agitation disrupts dipole alignment.<\/li>\n<\/ul>\n<h3>Domain Walls in Ferroelectrics<\/h3>\n<ul>\n<li><strong>Domain walls<\/strong>\u00a0are the\u00a0<strong>boundaries between differently polarised regions<\/strong>\u00a0in a ferroelectric material.<\/li>\n<li>These walls often exhibit\u00a0<strong>electrical or magnetic properties<\/strong>\u00a0different from the surrounding domains.<\/li>\n<li>Some\u00a0<strong>domain walls<\/strong>\u00a0may become\u00a0<strong>electrically conductive<\/strong>\u00a0even when the bulk of the material is non-conductive, or\u00a0<strong>magnetically active<\/strong>\u00a0even if the domain itself is nonmagnetic.<\/li>\n<li>These unique properties make domain walls potential candidates for\u00a0<strong>nanoelectronic components<\/strong>\u00a0for\u00a0<strong>memory, sensing, and signal processing<\/strong>\u00a0in\u00a0<strong>low-power devices<\/strong>.<\/li>\n<\/ul>\n<h2>New Visualisation Technique by ORNL<\/h2>\n<ul>\n<li>This method, called\u00a0<strong>Scanning Oscillator Piezoresponse Force Microscopy (SO-PFM)<\/strong>, is capable of detecting both\u00a0<strong>slow and abrupt movements<\/strong>\u00a0of domain walls under\u00a0<strong>rapidly fluctuating electric fields<\/strong>.<\/li>\n<li>Traditional methods offered only static snapshots, like a photo before and after a football play, missing the\u00a0<strong>intermediate dynamics<\/strong>.<\/li>\n<li>The new method creates\u00a0<strong>dynamic visualisations<\/strong>, helping researchers understand how domain walls\u00a0<strong>evolve\u00a0<\/strong>and how much\u00a0<strong>energy is required<\/strong>\u00a0to move them.<\/li>\n<li>It uses\u00a0<strong>precision-timed control electronics<\/strong>\u00a0with\u00a0<strong>atomic force microscopy (AFM)<\/strong>\u00a0to monitor real-time changes, a capability not previously possible.<\/li>\n<\/ul>\n<h2>Ferroelectricity FAQs<\/h2>\n<p><strong>Q1:\u00a0<\/strong>What is ferroelectricity?<br \/>\n<strong>Ans:<\/strong>\u00a0Ferroelectricity is a property of certain materials that exhibit spontaneous electric polarisation that can be reversed by applying an external electric field.<\/p>\n<p><strong>Q2:\u00a0<\/strong>What are ferroelectric materials used for?<br \/>\n<strong>Ans:<\/strong>\u00a0They are used in non-volatile memory devices, sensors, actuators, capacitors, and energy storage technologies.<\/p>\n<p><strong>Q3:\u00a0<\/strong>How is ferroelectricity different from piezoelectricity?<br \/>\n<strong>Ans:<\/strong>\u00a0While all ferroelectric materials are piezoelectric, not all piezoelectric materials are ferroelectric. Ferroelectricity requires switchable polarisation.<\/p>\n<p><strong>Source:\u00a0<\/strong><a href=\"https:\/\/phys.org\/news\/2025-05-dynamic-visualizations-expose-domain-walls.html\" target=\"_blank\" rel=\"nofollow noopener\">PHY<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ferroelectricity is a property of certain materials that exhibit spontaneous electric polarisation that can be reversed by applying an external electric field.<\/p>\n","protected":false},"author":8,"featured_media":47893,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[503,21,23],"class_list":{"0":"post-47892","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-upsc-prelims-current-affairs","8":"tag-ferroelectricity","9":"tag-prelims-pointers","10":"tag-upsc-prelims-current-affairs","11":"no-featured-image-padding"},"acf":[],"_links":{"self":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/47892","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/comments?post=47892"}],"version-history":[{"count":0,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/47892\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media\/47893"}],"wp:attachment":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media?parent=47892"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/categories?post=47892"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/tags?post=47892"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}