{"id":59655,"date":"2024-01-19T00:00:50","date_gmt":"2024-01-18T16:00:50","guid":{"rendered":"https:\/\/www.science.nus.edu.sg\/?p=59655"},"modified":"2024-01-19T09:04:30","modified_gmt":"2024-01-19T01:04:30","slug":"black-phosphorus-propels-spintronics-with-exceptional-anisotropic-spin-transport","status":"publish","type":"post","link":"https:\/\/www.science.nus.edu.sg\/blog\/2024\/01\/black-phosphorus-propels-spintronics-with-exceptional-anisotropic-spin-transport\/","title":{"rendered":"Black phosphorus propels spintronics with exceptional anisotropic spin transport"},"content":{"rendered":"<p><span lang=\"EN-GB\" style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">With modern electronic devices approaching the limits of Moore\u2019s law and the ongoing challenge of power dissipation in integrated circuit design, there is a need to explore alternative technologies beyond traditional electronics. Spintronics represents one such approach which could solve these issues and offer the potential for realising lower-power devices.<\/span><\/p>\n<p><span lang=\"EN-GB\" style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">A collaboration between research groups led by Professor Barbaros \u00d6ZYILMAZ and Assistant Professor Ahmet AVSAR both affiliated with the Department of Physics as well as the Department of Materials Science and Engineering at the National University of Singapore (NUS) have recently achieved a significant breakthrough by discovering the highly anisotropic spin transport nature of two-dimensional black phosphorus. <\/span><\/p>\n<p><span lang=\"EN-GB\" style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">Their findings have been published in the journal <i>Nature Materials<\/i>.<\/span><\/p>\n<p><span lang=\"EN-GB\" style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">In contrast to the conventional movement of charge in electronic devices, spintronics focuses on pioneering devices that manipulate the intrinsic property of electrons known as &#8220;spin&#8221;. Similar to charges in electrons, spin gives electrons a rotational quality like they are rotating around an axis, making them behave like tiny magnets, which have both a magnitude and a direction. The electron spin can exist in one of two states, referred to as spin \u201cup\u201d or spin \u201cdown\u201d. This is analogous to clockwise or anticlockwise rotation. While traditional electronic devices work by moving charges around the circuit, spintronics operates by manipulating the electron spin. This is important because moving electrical charges around traditional electric circuits necessarily causes some power to be lost as heat, whereas the motion of spin does not intrinsically dissipate as much heat. This characteristic could potentially allow for lower power device operation.<\/span><\/p>\n<p><span lang=\"EN-GB\" style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">Researchers are particularly interested in using materials at the atomically thin limit to investigate the properties of spin \u201cchannels\u201d, which are like wires that can facilitate the transport of spins. <\/span><\/p>\n<p><span lang=\"EN-GB\" style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">Emphasising the importance of material choice in spintronics devices, Prof \u00d6zyilmaz said, &#8220;Choosing the right material is paramount in spintronics. Highly performant and functional spin channel materials are the backbone of spintronics devices, allowing us to manipulate and control spins for diverse applications.&#8221; <\/span><\/p>\n<p><span lang=\"EN-GB\" style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">Black phosphorus is one such emerging material which is receiving attention for its favourable spintronics properties. Black phosphorus has a unique puckered crystal structure and this means that the behaviour of its spins is also dependent on their direction. <\/span><\/p>\n<p><span lang=\"EN-GB\" style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">Prof Avsar said, &#8220;Black phosphorus showcases highly anisotropic spin transport, deviating from the normal isotropic behaviour seen in conventional spin channel materials. Its crystal structure imparts directional characteristics to spin transport, offering new possibilities for controlling spintronics devices.&#8221;<\/span><\/p>\n<p><span lang=\"EN-GB\" style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">The researchers fabricated ultrathin black-phosphorus-based spin valves, encapsulated between hexagonal boron nitride layers. The spin transport anisotropy was studied by injecting spins into the black phosphorus at one end of the device, and measuring the spin signal at the other end by altering the direction of the spin current. Measurements were conducted while applying a strong magnetic field perpendicular to the black phosphorus layer and comparing it to those when a weak magnetic field is applied. The researchers observed that the application of a strong magnetic field resulted in a large increase in the spin signal. This effect arises from the puckered crystal structure, as the strong magnetic field forces the spins to point out of the plane of the material, altering their interaction with their surroundings and increasing their lifetime by a factor of six. <\/span><\/p>\n<p><span lang=\"EN-GB\" style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">This study also uncovers that ultrathin black phosphorus exhibits electrically tunable nanosecond spin lifetimes using a back-gate. The exceptional spin anisotropy, coupled with the ability to electrically modulate spin transport, enables creating novel devices that are not solely controlled by the binary state of spin (up or down) but also leverage spin anisotropy to achieve directional control. This positions black phosphorus as a unique platform for superior manipulation of spins\u2014a pivotal advancement in the realm of spintronics. <\/span><\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" width=\"1123\" height=\"486\" src=\"https:\/\/www.science.nus.edu.sg\/wp-content\/uploads\/2024\/01\/362._AA_PHY_20240111_1.jpg\" alt=\"\" class=\"alignnone size-full wp-image-59654\" srcset=\"https:\/\/www.science.nus.edu.sg\/wp-content\/uploads\/2024\/01\/362._AA_PHY_20240111_1.jpg 1123w, https:\/\/www.science.nus.edu.sg\/wp-content\/uploads\/2024\/01\/362._AA_PHY_20240111_1-300x130.jpg 300w, https:\/\/www.science.nus.edu.sg\/wp-content\/uploads\/2024\/01\/362._AA_PHY_20240111_1-1024x443.jpg 1024w, https:\/\/www.science.nus.edu.sg\/wp-content\/uploads\/2024\/01\/362._AA_PHY_20240111_1-768x332.jpg 768w\" sizes=\"(max-width: 1123px) 100vw, 1123px\" \/><\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\"><span lang=\"EN-GB\">The schematic illustrates the crystal structure of monolayer black phosphorus, with spins oriented in the favourable out-of-plane direction. [Credit: Alberto Ciarrocchi and Ahmet Avsar]<\/span><span lang=\"EN-GB\">\u00a0<\/span><\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\"><b><span lang=\"EN-GB\">Reference:<\/span><\/b><\/span><\/p>\n<p><span lang=\"EN-GB\" style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">Cording L; Liu J; Watanabe K; Taniguchi T; Avsar A*; \u00d6zyilmaz B*, &#8220;Highly anisotropic spin transport in ultrathin black phosphorus&#8221; Nature Materials, DOI: 10.1038\/s41563-023-01779-8 Published: 2024.<\/span><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>With modern electronic devices approaching the limits of Moore\u2019s law and the ongoing challenge of power dissipation in integrated circuit&#8230;<\/p>\n","protected":false},"author":16,"featured_media":59653,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[23,13],"tags":[],"class_list":["post-59655","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-advanced-materials","category-research-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.6 (Yoast SEO v23.6) - 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