{"id":12812,"date":"2025-05-19T10:40:14","date_gmt":"2025-05-19T10:40:14","guid":{"rendered":"https:\/\/hsmagnet.com\/?p=12434"},"modified":"2025-09-17T01:41:32","modified_gmt":"2025-09-17T01:41:32","slug":"wie-werden-alnico-magnete-entmagnetisiert-verstandnis-des-prozesses-und-der-entmagnetisierungsausrustung","status":"publish","type":"post","link":"https:\/\/hsmagnet.com\/de\/2025\/05\/19\/how-are-alnico-magnets-demagnetized-understanding-the-process-and-demagnetizing-equipment\/","title":{"rendered":"Entmagnetisieren und Ummagnetisieren von Alnico-Magneten: Wie steuerbarer Magnetismus spezielle Anwendungen antreibt"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/hsmagnet.com\/magnetic-materials\/alnico-magnets\/\" data-type=\"link\" data-id=\"https:\/\/hsmagnet.com\/magnetic-materials\/alnico-magnets\/\">Alnico magnets <\/a>are famous for their stability, temperature resistance, and ability to retain magnetism for decades. But unlike rare earth magnets, Alnico has a unique feature: it can be <strong>demagnetized and re-magnetized relatively easily<\/strong> without damage\u2014making it perfect for applications where the magnetic field needs to be switched or adjusted on demand.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">From <strong>magnetic chucks<\/strong> to precision measuring devices, this property opens up a whole world of engineering possibilities. In this article, we\u2019ll explore how Alnico magnets can be <strong>intentionally demagnetized and re-magnetized<\/strong>, the equipment used, and how engineers leverage this in real-world designs.<\/p>\n\n\n<div class=\"root-eb-toc-en53f wp-block-essential-blocks-table-of-contents\"><div class=\"eb-parent-wrapper eb-parent-eb-toc-en53f \"><div class=\"eb-toc-container eb-toc-en53f  eb-toc-is-not-sticky eb-toc-not-collapsible eb-toc-initially-not-collapsed eb-toc-scrollToTop style-1 list-style-none\" data-scroll-top=\"false\" data-scroll-top-icon=\"fas fa-angle-up\" data-collapsible=\"false\" data-sticky-hide-mobile=\"false\" data-sticky=\"false\" data-scroll-target=\"scroll_to_toc\" data-copy-link=\"false\" data-editor-type=\"\" data-hide-desktop=\"false\" data-hide-tab=\"false\" data-hide-mobile=\"false\" data-itemcollapsed=\"false\" data-highlight-scroll=\"false\"><div class=\"eb-toc-header\"><h2 class=\"eb-toc-title\">Table of Contents<\/h2><\/div><div class=\"eb-toc-wrapper \" data-headers=\"[{&quot;level&quot;:2,&quot;content&quot;:&quot;Why Alnico\\u2019s \\u201cControllable Magnetism\\u201d is Special&quot;,&quot;text&quot;:&quot;Why Alnico\\u2019s \\u201cControllable Magnetism\\u201d is Special&quot;,&quot;link&quot;:&quot;why-alnicos-controllable-magnetism-is-special&quot;},{&quot;level&quot;:2,&quot;content&quot;:&quot;How Alnico Magnets are Demagnetized&quot;,&quot;text&quot;:&quot;How Alnico Magnets are Demagnetized&quot;,&quot;link&quot;:&quot;how-alnico-magnets-are-demagnetized&quot;},{&quot;level&quot;:3,&quot;content&quot;:&quot;1. AC Field Demagnetization&quot;,&quot;text&quot;:&quot;1. AC Field Demagnetization&quot;,&quot;link&quot;:&quot;1-ac-field-demagnetization&quot;},{&quot;level&quot;:3,&quot;content&quot;:&quot;2. Thermal Demagnetization&quot;,&quot;text&quot;:&quot;2. Thermal Demagnetization&quot;,&quot;link&quot;:&quot;2-thermal-demagnetization&quot;},{&quot;level&quot;:3,&quot;content&quot;:&quot;3. Mechanical Shock&quot;,&quot;text&quot;:&quot;3. Mechanical Shock&quot;,&quot;link&quot;:&quot;3-mechanical-shock&quot;},{&quot;level&quot;:2,&quot;content&quot;:&quot;How Alnico Magnets are Re-Magnetized&quot;,&quot;text&quot;:&quot;How Alnico Magnets are Re-Magnetized&quot;,&quot;link&quot;:&quot;how-alnico-magnets-are-re-magnetized&quot;},{&quot;level&quot;:2,&quot;content&quot;:&quot;Special Applications of Controllable Alnico Magnetism&quot;,&quot;text&quot;:&quot;Special Applications of Controllable Alnico Magnetism&quot;,&quot;link&quot;:&quot;special-applications-of-controllable-alnico-magnetism&quot;},{&quot;level&quot;:3,&quot;content&quot;:&quot;1. Magnetic Chucks for Machining&quot;,&quot;text&quot;:&quot;1. Magnetic Chucks for Machining&quot;,&quot;link&quot;:&quot;1-magnetic-chucks-for-machining&quot;},{&quot;level&quot;:3,&quot;content&quot;:&quot;2. Adjustable Magnetic Field Systems&quot;,&quot;text&quot;:&quot;2. Adjustable Magnetic Field Systems&quot;,&quot;link&quot;:&quot;2-adjustable-magnetic-field-systems&quot;},{&quot;level&quot;:3,&quot;content&quot;:&quot;3. Magnetic Sensors and Test Equipment&quot;,&quot;text&quot;:&quot;3. Magnetic Sensors and Test Equipment&quot;,&quot;link&quot;:&quot;3-magnetic-sensors-and-test-equipment&quot;},{&quot;level&quot;:3,&quot;content&quot;:&quot;4. Magnetic Switches&quot;,&quot;text&quot;:&quot;4. Magnetic Switches&quot;,&quot;link&quot;:&quot;4-magnetic-switches&quot;},{&quot;level&quot;:2,&quot;content&quot;:&quot;Equipment for Magnetizing and Demagnetizing Alnico&quot;,&quot;text&quot;:&quot;Equipment for Magnetizing and Demagnetizing Alnico&quot;,&quot;link&quot;:&quot;equipment-for-magnetizing-and-demagnetizing-alnico&quot;},{&quot;level&quot;:2,&quot;content&quot;:&quot;Why Alnico Beats NdFeB for Switchable Systems&quot;,&quot;text&quot;:&quot;Why Alnico Beats NdFeB for Switchable Systems&quot;,&quot;link&quot;:&quot;why-alnico-beats-ndfeb-for-switchable-systems&quot;}]\" data-visible=\"[true,true,true,true,true,true]\" data-delete-headers=\"[{&quot;label&quot;:&quot;Why Alnico\\u2019s \\u201cControllable Magnetism\\u201d is Special&quot;,&quot;value&quot;:&quot;why-alnicos-controllable-magnetism-is-special&quot;,&quot;isDelete&quot;:false},{&quot;label&quot;:&quot;How Alnico Magnets are Demagnetized&quot;,&quot;value&quot;:&quot;how-alnico-magnets-are-demagnetized&quot;,&quot;isDelete&quot;:false},{&quot;label&quot;:&quot;1. AC Field Demagnetization&quot;,&quot;value&quot;:&quot;1-ac-field-demagnetization&quot;,&quot;isDelete&quot;:false},{&quot;label&quot;:&quot;2. Thermal Demagnetization&quot;,&quot;value&quot;:&quot;2-thermal-demagnetization&quot;,&quot;isDelete&quot;:false},{&quot;label&quot;:&quot;3. Mechanical Shock&quot;,&quot;value&quot;:&quot;3-mechanical-shock&quot;,&quot;isDelete&quot;:false},{&quot;label&quot;:&quot;How Alnico Magnets are Re-Magnetized&quot;,&quot;value&quot;:&quot;how-alnico-magnets-are-re-magnetized&quot;,&quot;isDelete&quot;:false},{&quot;label&quot;:&quot;Special Applications of Controllable Alnico Magnetism&quot;,&quot;value&quot;:&quot;special-applications-of-controllable-alnico-magnetism&quot;,&quot;isDelete&quot;:false},{&quot;label&quot;:&quot;1. Magnetic Chucks for Machining&quot;,&quot;value&quot;:&quot;1-magnetic-chucks-for-machining&quot;,&quot;isDelete&quot;:false},{&quot;label&quot;:&quot;2. Adjustable Magnetic Field Systems&quot;,&quot;value&quot;:&quot;2-adjustable-magnetic-field-systems&quot;,&quot;isDelete&quot;:false},{&quot;label&quot;:&quot;3. Magnetic Sensors and Test Equipment&quot;,&quot;value&quot;:&quot;3-magnetic-sensors-and-test-equipment&quot;,&quot;isDelete&quot;:false},{&quot;label&quot;:&quot;4. Magnetic Switches&quot;,&quot;value&quot;:&quot;4-magnetic-switches&quot;,&quot;isDelete&quot;:false},{&quot;label&quot;:&quot;Equipment for Magnetizing and Demagnetizing Alnico&quot;,&quot;value&quot;:&quot;equipment-for-magnetizing-and-demagnetizing-alnico&quot;,&quot;isDelete&quot;:false},{&quot;label&quot;:&quot;Why Alnico Beats NdFeB for Switchable Systems&quot;,&quot;value&quot;:&quot;why-alnico-beats-ndfeb-for-switchable-systems&quot;,&quot;isDelete&quot;:false}]\" data-smooth=\"true\" data-top-offset=\"\"><div class=\"eb-toc__list-wrap\"><ul class=\"eb-toc__list\"><li><a href=\"#why-alnicos-controllable-magnetism-is-special\">Why Alnico\u2019s \u201cControllable Magnetism\u201d is Special<\/a><li><a href=\"#how-alnico-magnets-are-demagnetized\">How Alnico Magnets are Demagnetized<\/a><ul class=\"eb-toc__list\"><li><a href=\"#1-ac-field-demagnetization\">1. AC Field Demagnetization<\/a><li><a href=\"#2-thermal-demagnetization\">2. Thermal Demagnetization<\/a><li><a href=\"#3-mechanical-shock\">3. Mechanical Shock<\/a><\/li><\/ul><li><a href=\"#how-alnico-magnets-are-re-magnetized\">How Alnico Magnets are Re-Magnetized<\/a><li><a href=\"#special-applications-of-controllable-alnico-magnetism\">Special Applications of Controllable Alnico Magnetism<\/a><ul class=\"eb-toc__list\"><li><a href=\"#1-magnetic-chucks-for-machining\">1. Magnetic Chucks for Machining<\/a><li><a href=\"#2-adjustable-magnetic-field-systems\">2. Adjustable Magnetic Field Systems<\/a><li><a href=\"#3-magnetic-sensors-and-test-equipment\">3. Magnetic Sensors and Test Equipment<\/a><li><a href=\"#4-magnetic-switches\">4. Magnetic Switches<\/a><\/li><\/ul><li><a href=\"#equipment-for-magnetizing-and-demagnetizing-alnico\">Equipment for Magnetizing and Demagnetizing Alnico<\/a><li><a href=\"#why-alnico-beats-ndfeb-for-switchable-systems\">Why Alnico Beats NdFeB for Switchable Systems<\/a><\/ul><\/div><\/div><\/div><\/div><\/div>\n\n\n<h2 class=\"wp-block-heading\">Why Alnico\u2019s \u201cControllable Magnetism\u201d is Special<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Reversible magnetization<\/strong> \u2014 unlike ferrite magnets, Alnico can be repeatedly demagnetized and re-magnetized with minimal degradation.<\/li>\n\n\n\n<li><strong>Stable temperature performance<\/strong> \u2014 maintains field strength in extreme heat.<\/li>\n\n\n\n<li><strong>Low coercivity compared to NdFeB<\/strong> \u2014 makes it easier to change its magnetic state when desired.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This means an Alnico magnet can act like a <strong>\u201cswitchable\u201d<\/strong> permanent magnet in certain designs.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How Alnico Magnets are Demagnetized<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. <strong>AC Field Demagnetization<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Passes the magnet through a gradually decreasing alternating magnetic field.<\/li>\n\n\n\n<li>Scrambles domain alignment until no net field remains.<\/li>\n\n\n\n<li>Most common for precision applications.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. <strong>Thermal Demagnetization<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Heats beyond Curie temperature (~800\u00b0C) to erase magnetism.<\/li>\n\n\n\n<li>Not ideal for repeated cycles due to potential microstructure change.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. <strong>Mechanical Shock<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Can knock domains out of alignment, but uncontrolled and not recommended.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/hsmagnet.com\/wp-content\/uploads\/2025\/05\/Step-by-step-diagram-of-demagnetizing-Alnico-magnets-using-AC-field-and-thermal-methods-1024x683.webp\" alt=\"Step-by-step diagram of demagnetizing Alnico magnets using AC field and thermal methods\" class=\"wp-image-13804\" srcset=\"https:\/\/hsmagnet.com\/wp-content\/uploads\/2025\/05\/Step-by-step-diagram-of-demagnetizing-Alnico-magnets-using-AC-field-and-thermal-methods-1024x683.webp 1024w, https:\/\/hsmagnet.com\/wp-content\/uploads\/2025\/05\/Step-by-step-diagram-of-demagnetizing-Alnico-magnets-using-AC-field-and-thermal-methods-300x200.webp 300w, https:\/\/hsmagnet.com\/wp-content\/uploads\/2025\/05\/Step-by-step-diagram-of-demagnetizing-Alnico-magnets-using-AC-field-and-thermal-methods-768x512.webp 768w, https:\/\/hsmagnet.com\/wp-content\/uploads\/2025\/05\/Step-by-step-diagram-of-demagnetizing-Alnico-magnets-using-AC-field-and-thermal-methods-600x400.webp 600w, https:\/\/hsmagnet.com\/wp-content\/uploads\/2025\/05\/Step-by-step-diagram-of-demagnetizing-Alnico-magnets-using-AC-field-and-thermal-methods.webp 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How Alnico Magnets are Re-Magnetized<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Re-magnetization is essentially the reverse process of demagnetization:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Expose the magnet to a strong DC magnetic field<\/strong> \u2014 usually in a magnetizing coil or pulse magnetizer.<\/li>\n\n\n\n<li><strong>Aligns the magnetic domains<\/strong> into a uniform direction.<\/li>\n\n\n\n<li>Field strength needed for full saturation is typically in the range of <strong>2\u20133 kOe (160\u2013240 kA\/m)<\/strong>.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">Special Applications of Controllable Alnico Magnetism<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1. Magnetic Chucks for <\/strong>Machining<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Used in metalworking to hold workpieces without clamps.<\/li>\n\n\n\n<li>Alnico magnets inside are demagnetized to release parts and re-magnetized to hold them securely.<\/li>\n\n\n\n<li>Often combined with steel pole pieces for better flux control.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. Adjustable Magnetic Field Systems<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Combine Alnico with high-energy NdFeB magnets.<\/li>\n\n\n\n<li>Rotating or reversing the Alnico magnet changes the combined field strength\u2014perfect for variable clamping force or magnetic field tuning.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. Magnetic Sensors and Test Equipment<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Instruments may need a resettable magnetic reference.<\/li>\n\n\n\n<li>Alnico allows repeated adjustments without replacing the magnet.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">4. Magnetic Switches<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Alnico magnets can be \u201cturned off\u201d or \u201con\u201d by shifting their magnetic orientation, enabling simple, mechanical magnetic control systems.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"670\" height=\"446\" src=\"https:\/\/hsmagnet.com\/wp-content\/uploads\/2025\/05\/Examples-of-Alnico-in-magnetic-chucks-and-adjustable-field-systems-for-industrial-use.webp\" alt=\"Examples of Alnico in magnetic chucks and adjustable field systems for industrial use\" class=\"wp-image-13805\" srcset=\"https:\/\/hsmagnet.com\/wp-content\/uploads\/2025\/05\/Examples-of-Alnico-in-magnetic-chucks-and-adjustable-field-systems-for-industrial-use.webp 670w, https:\/\/hsmagnet.com\/wp-content\/uploads\/2025\/05\/Examples-of-Alnico-in-magnetic-chucks-and-adjustable-field-systems-for-industrial-use-300x200.webp 300w, https:\/\/hsmagnet.com\/wp-content\/uploads\/2025\/05\/Examples-of-Alnico-in-magnetic-chucks-and-adjustable-field-systems-for-industrial-use-600x399.webp 600w\" sizes=\"auto, (max-width: 670px) 100vw, 670px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Equipment for Magnetizing and Demagnetizing Alnico<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>AC Demagnetizers<\/strong> \u2014 table-top, tunnel, or custom coils.<\/li>\n\n\n\n<li><strong>DC Magnetizers<\/strong> \u2014 capacitor-discharge pulse magnetizers for instant saturation.<\/li>\n\n\n\n<li><strong>Hybrid Units<\/strong> \u2014 combine both functions for fast switching in production.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Why Alnico Beats NdFeB for Switchable Systems<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Property<\/th><th>Alnico<\/th><th>NdFeB<\/th><\/tr><\/thead><tbody><tr><td>Coercivity<\/td><td>Low (easy to change)<\/td><td>High (hard to change)<\/td><\/tr><tr><td>Max operating temp<\/td><td>500\u00b0C<\/td><td>150\u2013200\u00b0C<\/td><\/tr><tr><td>Field adjustability<\/td><td>Excellent<\/td><td>Very poor<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The ability to <strong>repeatedly demagnetize and re-magnetize<\/strong> makes Alnico magnets uniquely suited for switchable magnetic devices, variable holding systems, and precision magnetic field controls. When paired with proper demagnetization and magnetization equipment, engineers can design magnetic systems that behave almost like electromechanical switches\u2014without the constant power draw of an electromagnet.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/hsmagnet.com\/\" data-type=\"link\" data-id=\"https:\/\/hsmagnet.com\/\">HS Magnetics<\/a><\/strong> not only manufactures precision <a href=\"https:\/\/hsmagnet.com\/magnetic-materials\/alnico-magnets\/\" data-type=\"link\" data-id=\"https:\/\/hsmagnet.com\/magnetic-materials\/alnico-magnets\/\">Alnico magnets<\/a> but also offers guidance on designing controllable magnetic systems for industrial, aerospace, and research applications.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Alnico magnets are famous for their stability, temperature resistance, and ability to retain magnetism for decades. But unlike rare earth magnets, Alnico has a unique feature: it can be demagnetized and re-magnetized relatively easily without damage\u2014making it perfect for applications where the magnetic field needs to be switched or adjusted on demand. From magnetic chucks [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":13803,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_eb_attr":"","footnotes":""},"categories":[25],"tags":[],"class_list":["post-12812","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-alnico-magnet"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Demagnetize Alnico Magnets | HS Magnetics<\/title>\n<meta name=\"description\" content=\"Learn how Alnico magnets are demagnetized using AC fields, heat, or shock. 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