{"id":881,"date":"2022-04-13T13:42:56","date_gmt":"2022-04-13T13:42:56","guid":{"rendered":"https:\/\/systronemv.com\/shielding\/magnete\/"},"modified":"2024-03-14T10:59:19","modified_gmt":"2024-03-14T10:59:19","slug":"magnets","status":"publish","type":"page","link":"https:\/\/systronemv.com\/en\/shielding\/magnets\/","title":{"rendered":"Magnets"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row][vc_column][systron_generalboxes]Permanent magnets, but also magnets generated by coils, generate strong static magnetic fields, which can amount to several teslas in the core. NMR magnets belong to this category, among others.[\/systron_generalboxes][\/vc_column][\/vc_row][vc_row][vc_column][systron_generalboxes box_color=&#8221;general-color&#8221; left_general=&#8221;Title&#8221; box_left_title=&#8221;Shielding NMR&#8221;]NMR spectroscopy is a method for investigating the electronic environment of individual atoms and their interactions with neighbouring atoms. The sample is placed in a strong, static magnetic field caused by a current-carrying coil.<\/p>\n<div id='gallery-1' class='gallery galleryid-881 gallery-columns-3 gallery-size-full'><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/systronemv.com\/wp-content\/uploads\/2022\/04\/nmr-stray-field.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"601\" src=\"https:\/\/systronemv.com\/wp-content\/uploads\/2022\/04\/nmr-stray-field.jpg\" class=\"attachment-full size-full landscape\" alt=\"Magnets - NMR shielding: Stray field of an NMR magnet\" aria-describedby=\"gallery-1-530\" srcset=\"https:\/\/systronemv.com\/wp-content\/uploads\/2022\/04\/nmr-stray-field.jpg 800w, https:\/\/systronemv.com\/wp-content\/uploads\/2022\/04\/nmr-stray-field-300x225.jpg 300w, https:\/\/systronemv.com\/wp-content\/uploads\/2022\/04\/nmr-stray-field-768x577.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a>\n\t\t\t<\/div>\n\t\t\t\t<figcaption class='wp-caption-text gallery-caption' id='gallery-1-530'>\n\t\t\t\tStray field of an NMR magnet\n\t\t\t\t<\/figcaption><\/figure>\n\t\t<\/div>\n\n<div class=\"text-article\">\n<p>To reduce the strong magnetic fields of such DC magnets, stray field shields with high saturation must be used. This limits areas around the magnets to &lt;5 Gauss (500\u00b5T), which is the prescribed limit for electrical implants such as pacemakers. However, the application is not only limited to adhering to the 5 Gauss line, but also depends on the customer&#8217;s specifications. In the field of biological research, for example, values in the order of magnitude of the earth&#8217;s magnetic field, i.e. 50\u00b5T, are often required so that biological experiments can be carried out in a &#8220;natural&#8221; environment.<\/p>\n<p>With stray field shielding, the fields of strong magnets, caused by unshielded and shielded NMRs, are effectively reduced. Pure iron, which has a high saturation flux density, is usually used as shielding material for strong magnetic DC fields.<\/p>\n<div id='gallery-2' class='gallery galleryid-881 gallery-columns-3 gallery-size-full'><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/systronemv.com\/en\/shielding\/magnets\/img_5856-800-2-2\/'><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/systronemv.com\/wp-content\/uploads\/2022\/04\/IMG_5856-800-1.jpg\" class=\"attachment-full size-full landscape\" alt=\"Magnets - Shielding: Pure iron shielding around NMR magnet\" aria-describedby=\"gallery-2-535\" srcset=\"https:\/\/systronemv.com\/wp-content\/uploads\/2022\/04\/IMG_5856-800-1.jpg 800w, https:\/\/systronemv.com\/wp-content\/uploads\/2022\/04\/IMG_5856-800-1-300x169.jpg 300w, https:\/\/systronemv.com\/wp-content\/uploads\/2022\/04\/IMG_5856-800-1-768x432.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a>\n\t\t\t<\/div>\n\t\t\t\t<figcaption class='wp-caption-text gallery-caption' id='gallery-2-535'>\n\t\t\t\tPure iron shielding around NMR magnet\n\t\t\t\t<\/figcaption><\/figure>\n\t\t<\/div>\n\n<p>The thickness of the material and the required shielding area is determined by the Finite element method (FEM) \u00a0simulations. Compared to alternating field shielding, DC shielding is typically much thicker and correspondingly heavier.<\/p>\n<div id='gallery-3' class='gallery galleryid-881 gallery-columns-3 gallery-size-full'><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/systronemv.com\/en\/shielding\/magnets\/3d_fem_nmr_shielded-800-2-2\/'><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"587\" src=\"https:\/\/systronemv.com\/wp-content\/uploads\/2022\/04\/3D_FEM_NMR_Shielded-800-1.jpg\" class=\"attachment-full size-full landscape\" alt=\"Magnets - Shielding: 3D FEM magnetic field simulation\" aria-describedby=\"gallery-3-538\" srcset=\"https:\/\/systronemv.com\/wp-content\/uploads\/2022\/04\/3D_FEM_NMR_Shielded-800-1.jpg 800w, https:\/\/systronemv.com\/wp-content\/uploads\/2022\/04\/3D_FEM_NMR_Shielded-800-1-300x220.jpg 300w, https:\/\/systronemv.com\/wp-content\/uploads\/2022\/04\/3D_FEM_NMR_Shielded-800-1-768x564.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a>\n\t\t\t<\/div>\n\t\t\t\t<figcaption class='wp-caption-text gallery-caption' id='gallery-3-538'>\n\t\t\t\t3D FEM simulation of a magnetic shielding for an NMR magnet\n\t\t\t\t<\/figcaption><\/figure>\n\t\t<\/div>\n\n<\/div>\n<p>[\/systron_generalboxes][\/vc_column][\/vc_row][vc_row][vc_column][systron_referenceboxes box_left_title=&#8221;Reference&#8221; references=&#8221;%5B%7B%22reference_year%22%3A%222019%22%2C%22reference_title%22%3A%22NMR-Shielding%20Institute%20Pasteur%20Paris%22%2C%22url%22%3A%22url%3Ahttps%253A%252F%252Fsystronemv.com%252Fen%252Freferences%252Freference-magnets%252F%7Ctitle%3AHome%22%7D%5D&#8221;][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column][systron_generalboxes]Permanent magnets, but also magnets generated by coils, generate strong static magnetic fields, which can amount to several teslas in the core. NMR magnets belong to this category, among others.[\/systron_generalboxes][\/vc_column][\/vc_row][vc_row][vc_column][systron_generalboxes box_color=&#8221;general-color&#8221; left_general=&#8221;Title&#8221; box_left_title=&#8221;Shielding NMR&#8221;]NMR spectroscopy is a method for investigating the electronic environment of individual atoms and their interactions with neighbouring atoms. The sample is [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":856,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"class_list":["post-881","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.2 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Magnets - Shielding NMR MRI<\/title>\n<meta name=\"description\" content=\"Magnets - Shielding: NMR spectroscopy, MRI, pure iron shielding, simulation 5 gauss line\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/systronemv.com\/en\/shielding\/magnets\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Magnets\" \/>\n<meta property=\"og:description\" content=\"Magnets - 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