Core and Surface Strength of Magnets

Fabricators and vendors of magnetic jewellery just state the Gauss rating of the magnets embedded in their article without specifying whether it is core or surface strength. Some of these magnetic jewellery articles boast and boost the Gauss strength often as high as 15, 000. There is a catch. Read to find out…

Magnets have two types of strength: core strength and surface strength. What is relevant for users of gem & jewellery containing magnets is to check out the surface strength as this s the one that penetrates the skin. Only few magnetic jewellery fabricators are willing to disclose both ratings. Many would not attempt to do so, lest it confuses the buyers.

Core strength: This is the nominal strength of a magnet. Different terminology is used to indicate core strength. Manufactured rate, Material value, Central gauss, Face value and Internal strength are some of the alternatives used by manufacturers to denote core strength.

Surface strength: This is the real strength of a magnet. Terminology used to refer real strength of magnet includes Actual reading and External strength.

You as a buyer and user have every right to ask from the sellers of magnetic jewellery the surface strength of magnets placed within the articles. If nothing is forthcoming or specified as surface strength then take the given Gauss rating by the seller and divide it by 4. For example if the magnetic jewellery piece is stated to possess 12,000 Gauss then you can easily find out that the surface strength as 3,000 Gauss.

However, original manufacturers of magnets, who are not jewellers, generally give a range value for both core and surface strength. For example, Neodymium magnet is marketed with a core strength between 10,000 to 12,500 Gauss and surface strength with a range of 1,700 and 2,500 Gauss.

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Muthu Ashraff

Cosmic Adviser

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Skype : cosmicgems

E-mail : cosmicgems@gmail.com

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Indicators of Magnetic Strength

Most of you buy and use magnetic jewellery. Well and good. You must also know how magnets used by gem & Jewellery industry fare in terms of magnetic strength. Here are five indicators that tell you the level of magnetic power.

1. Coercive Power: This is a shortened form of ‘coercive magnetic field strength”. Often abbreviated as “ Hc”, it indicates the point where a magnet loses its relative power vis-à-vis another external magnetic source. Alternatively we can say the point where the magnet gets de-magnetized by the presence of another magnet. This indicator is given as Mega Gauss Oersted (MGOe or simply as Oersted). The higher the Oersted the higher the coercive power. Neodymium demonstrates the highest coercive power for all magnets at 12,300 Oersted whereas Alnico has the lowest Oersted of 640.

2. Magnetic Flux Density: Also known as “Residual Magnetic Flux Density” and abbreviated as “Br” this indicates the maximum magnetic field strength that can be produced and sustained by a magnet. It is given in Gauss rating. Higher is better. Neodymium records the highest maximum flux density of 12,800 Gauss while Ceramic Ferrite ticks the lowest at 3,900.

3. Overall Energy Density: Related to the above two indicators, the overall energy density is given as an integer. It is often abbreviated as “Bmax”. Highest overall energy density is shown by the most robust one. Neodymium has the highest overall energy density of 40. Lowest Bmax of 3.5 is associated with Ceramic Ferrite.

4. Operating Temperature: Abbreviated as “Tmax”, this shows the maximum operating temperature up to which the magnet can function without losing its magnetic field. When this point is exceeded the magnet loses its strength and after cooling down it regains the magnetic field. Alnico has the highest Tmax of 540 degree Celsius. Contrarily the all-powerful Neodymium can be operated only up to 150 degree Celsius.

5. Curie Temperature: Abbreviated as “Tcurie” this indicates the temperature point where a magnet becomes permanently disabled and demagnetized. Once again Alnico shows the highest Curie temperature of 860 degree Celsius and once again Neodymium can be permanently disabled at 310 degree Celsius.

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Muthu Ashraff

Cosmic Adviser

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Choosing Right Magnet for Jewellery

There are five types of magnets that can be used in magnetic jewellery. Here is the summary view of these magnets to help you choosing right magnet for your magnetic jewellery

Barium Ceramic Ferrite: Moderate price and strength along with the fact that it is available in different sizes and forms have helped in its popularity in magnetic jewellery. Hard yet brittle its resistance to external demagnetization is low. Compensating feature is it has excellent anti-corrosion feature. Positive cosmics of using this magnet works in two ways: Inside it gives you the ability in balancing between and amongst competing forces within you. Outside this magnet can place you in a stronger position to resist pressure and deflect negative energy.

Strontium Ceramic Ferrite: Almost similar to Barium Ceramic Ferrite except that the element Barium is replaced with Strontium in this case. Billed as the most bio-compatible magnet it stops pain signals travelling towards the brain. Moreover it resists negative reactions emanating from weather changes as well as guard against invasive chemicals and solvents. Positive cosmics include sense of refinement and iridescence along with luminous aura around you. You get physical strength reverberating in your bones and muscles; mental alertness cascading in your thoughts and actions.

Neodymium: Popular due to highest magnetic strength at affordable price range. Light in weight yet packed with power & strength to withstand external demagnetizing agents. Major negatives are brittleness, lesser mechanical strength and low resistance to corrosion. Positive cosmics starts as you touch this magnet when you get the feel of its strength running through your veins. You get so elated and float with strength of power within you. It balances your energy and useful in many ways in health and wellness.

Samarium Cobalt: Except for the brittleness this magnet is endowed with several pluses. High mechanical strength and excellent ant-corrosion feature. When you make a trade –off between price and performance Samarium Cobalt is the magnet that you should go for. Key positive cosmics in the form heightened awareness, increased metabolism and relief of pain in bones and joints lend credence to your choosing this magnet

Alnico: This magnet can work in adverse conditions and heated environment. High magnetic strength, high resistance to corrosion and high mechanical strength compensate for its low resistance to external demagnetizing agents. It is recommended for cases where generation of strong magnetic density in closed magnetic circuit is mandated. Children and invalids requiring intense but moderate magnetic power can safely use Alnico magnets. Alnico in magnetic jewellery gives you positive cosmics in treating insomnia, neurosis, hypertension and relief of pain in bones and joints. It also provides you with a feeling of strength and sense of balance.

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Muthu Ashraff

Cosmic Adviser

Mobile : +94 777 265677

Skype : cosmicgems

E-mail : cosmicgems@gmail.com

Web: http://www.cosmicgemslanka.com

 

Why Use Alnico Magnetic Jewellery?

Alnico is an acronym referring to aluminium, nickel and cobalt alloy that was made into magnet. Its use in magnetic jewellery has never been explored. This blog post simply does that.

Discovered by Metallurgist Tokushichi Mishima of Japan in 1931 and developed over the years by many others, Alnico magnet remained as the strongest magnet on Earth till rare earth magnets were found in 1970s. Today rare earth magnets made from Neodymium and Samarium have eclipsed the use of Alnico in industry. But gem & jewellery industry is slowly waking up to find its usefulness in the field of magnetic jewellery. One key reason for this new-found awareness is the distinct alloy of elements that go into the production of Alnico magnet. In addition to aluminium, nickel and cobalt as main base, copper, titanium and iron are also added to make a formidable fortress of magnetic energy.

Alnico is fabricated using two processes casting and sintering. Significantly the sintered Alnico is packed with more power and can be produced in various shapes including disc, ring and rectangle. It is the only magnet that has a unique feature of conducting electricity resulting in the generation of electromagnetic energy badly needed by many users of magnetic jewellery.

Positive features galore in Alnico magnet. It can operate under adverse conditions and high operating temperature rising as much as 540 degree Celsius, highest known for any type of magnets. Similarly melting point known as Curie temperature is 860 degree Celsius which is once again the highest recorded for a magnet so far.

Magnetic Flux Density which is the measure that tracks the continuous production of magnetic power is ticked at 12,500 Gauss slightly below the Neodymium magnet. Alnico has several other plus points. High resistance to corrosion and high mechanical strength make it an ideal one for magnetic jewellery that uses main metals as diverse as silver, gold and titanium.

On the flip side, Alnico has low power of resistance to external magnetizing field. This we call as Coercive Magnetic Field Strength. At 640 MGOe (Mega Gauss Oersted). Alnico ranks lowest amongst the different types of magnets. As a result Alnico suffers from demagnetization when exposed to highly magnetized environment. Moreover, it can also suffer from demagnetization due to massive shock.

Despite these negatives, Alnico magnetic jewellery is ideal for bracelets, amulets and anklets with Gauss strength less than 3000 and where production of strong magnetic flux density in closed magnetic circuit is mandated. Children and invalids requiring intense but less magnetic power can safely use Alnico magnetic jewellery.

Alnico magnetic jewellery gives you positive cosmics in treating insomnia, neurosis, hypertension and relief of pain in bones and joints. It also provides you with a feeling of strength and sense of balance.

Keep in touch!

Muthu Ashraff

Cosmic Adviser

Mobile : +94 777 265677

Skype : cosmicgems

E-mail : cosmicgems@gmail.com

Web: http://www.cosmicgemslanka.com

Samarium Cobalt Magnetic Jewellery

Rare earth element Samarium mixed with Cobalt is an excellent magnet that found its way to magnetic jewellery decades ago. Gem & jewellery industry has pounced on it for its dual function: its magnetic capability and anti-rusting feature. Read more…

Samarium Cobalt magnet is referred to by its short form name as “SmCo Magnet” or in much more user friendly term of “Samco”. Introduced in 1970 Samco is the second powerful man- made magnet after Neodymium. It is bio-compatible despite the scare over its constituent alloy of Cobalt. The mixture of Samarium with Cobalt has all the pluses the gem & jewellery industry is looking for: Samarium is hard and brittle Cobalt is lustrous and shatter-proof. Both are hypoallergenic and have excellent anti-corrosive capability. The finished product can fit in many types of jewellery wear including bracelet, amulet, choker and anklet.

Price and performance wise Samco ranks second to Neodymium. Yet in terms usability Samco scores well over its competitors in the magnet fraternity. It is the only magnet that can balance size, performance and price at even keel. May be for this reason Samco is used in aerospace industry where performance, size and price are parts of an equation. Added feature of Samco is that it can function under adverse conditions and high operating temperature rising as much as 350 degree Celsius.

Magnetic Flux Density which is the measure that tracks the continuous production of magnetic power is ticked at 10,500 Gauss. Due to this higher performance even quarter inch thick Samco magnetic strip would be more than sufficient for a bracelet.

Naturally Samco does not lose magnetism over the years and has higher resistance to external magnetizing fields. This we call as Coercive Magnetic Field Strength. For Samco this magnetic field strength is slated high. Consequently even if Samco is exposed to other magnets it would stay intact without losing its magnetic quality. You can test this hypothesis by walking through a magnetised environment. You would be elated to observe that your Samco magnetic jewellery does not suffer any loss of magnetism.

There are few disadvantages of Samco magnet though. Due to its brittle nature it is prone to chipping on edges; however it does not fracture unless you hit with a hammer. Samco magnetic jewellery gives you positive cosmics in the form heightened awareness, increased metabolism and relief of pain in bones and joints. A major negative is that for some users it can increase toxicity. Those who suffer from eye and skin irritation are advised to wear it after consulting with a health professional.

Keep in touch!

Muthu Ashraff

Cosmic Adviser

Mobile : +94 777 265677

Skype : cosmicgems

E-mail : cosmicgems@gmail.com

Web: http://www.cosmicgemslanka.com

 

Strontium Magnetic Jewellery

One of the popular magnets used in magnetic jewellery is Ceramic Ferrite mixed with Strontium Carbonate. Most manufacturers of magnetic jewellery do not disclose what kind of Ceramic Ferrite mixture they are using. It is your watch out to find out this part of the story. Read for more details…

Ceramic Ferrite is simply mixture of ceramic clay along with Iron powder and either of Barium Carbonate or Strontium Carbonate. In this blog I am talking about Ceramic Ferrite made with Strontium Carbonate as a constituent alloy. The technical script for this Strontium mixed magnet is given as Sr Fe 12 O 19. Here are major salients of Ceramic Ferrite mixed with Strontium Carbonate:

1. Ceramic Ferrite with Strontium is easy to manufacture in various shapes and different sizes. Some of the shapes include round, square, rectangle, arc, triangle, horseshoe and so on. It can be subjected to multi type production processes including sintering, pressing and injection moulding. In gem & jewellery industry sintered one is very popular.

2. Gem & jewellery industry chooses this magnet as it can be mounted easily on jewellery wears such as bracelet, wrist band and wrap where it snugs in even the minute jewellery.

3. Although this magnet is brittle it is the choice of many for its inherent hardness which is measured in Mohs scale at 7 point and for the excellent anti-corrosion capability. Consequently no coating or plating is required. A major negative is the lower mechanical strength that forbids filigree type designs. In any case such designs are not needed in magnetic jewellery.

4. Price wise Ceramic Ferrite with Strontium is inexpensive due to several factors. Easy manufacturing process apart, the major raw material Strontium is cheap, abundant and a non-strategic material helping keep the prices tag within reach of many buyers.

5. As Ceramic Ferrite with Strontium has lowest magnetic flux density among the type of magnets its use is fairly restricted to magnetic jewellery where the required Gauss strength is 1,500 or less.

6. Ceramic Ferrite with Strontium is a permanent magnet with longevity. Moreover, it has fairly higher resistance to external magnetizing fields. This we call as Coercive Magnetic Field Strength. There is an option to have this magnet as soft and hard ones. The soft Ferrite has somewhat lower Coercive magnetic field Strength than the hard one. If you walk through highly magnetised environment your magnetic jewellery made of Ceramic Ferrite with Strontium might suffer loss of magnetism depending on whether it is soft or hard ferrite and the level of ambient magnetic force surrounding you.

7. This magnet variety has higher operating temperature capability. Maximum operating temperature of 300 degree Celsius means this magnet can be easily used in various types of jewellery. However, at operating temperature of 460 degree Celsius it would lose magnetic strength altogether.

8. One of the key pull factors of strontium mixed Ceramic Ferrite is that it stops pain signals travelling towards the brain. As a bio-compatible magnet it is harmless to plants, animals and human being. Another pull factor is that it resists weather and invasive chemicals and solvents. When you use Strontium mixed Ceramic Ferrite you get refinement, iridescence and luminous aura around you. You get physical strength reverberating in your bones and muscles; mental alertness cascading in your thoughts and actions. Lot depends on your personal cosmics and equally your liking of the Strontium mixed magnetic jewellery. Wise geek must do an assessment of personal cosmics before selecting magnetic jewellery decked with Strontium mixed Ceramic Ferrite.

Keep track!

Muthu Ashraff

Cosmic Adviser

Mobile : +94 777 265677

Skype : cosmicgems

E-mail : cosmicgems@gmail.com

Web: http://www.cosmicgemslanka.com