![]() What doesn't the Surface Field number tell me? The bigger magnet is projecting the magnetic field over a much larger area and distance than the little one. We'll plug in a distance value equal to 1" in this case, and the calculator again indicates 599 Gauss. The Magnetic Field strength at that distance is 599 Gauss. For Distance, enter a value equal to the length of one of our sides, in this case: 0.25". Using the Magnet Calculator, we can find the field at a specified distance. A 1/4" cube (B444) has a Surface Field of 5754 Gauss. Let's go back to the cubes for an example. The actual size varies with the magnet size. The dimensionless shape of the magnetic field is the same for two same-shaped magnets. ![]() A D81 (1/2" diameter, 1/16" thick) has the same diameter-to-thickness ratio as the D401 and the same Surface Field! So does the:Īll of these have the exact same Surface Field strength.īut won't a bigger magnet project a bigger field? If the size-to-thickness ratio is the same, you'll see the same Surface Field values. A thicker D48 (1/4" diameter, 1/2" thick) has a Surface Field of 6403 Gauss! A D401 (1/4" diameter, 1/32" thick) has a Surface Field of 1601 Gauss. Thicker magnets will have higher values.įor example, consider two magnets both having a diameter of 1/4". Magnets that are thinner in the direction of their magnetization will generally have lower Surface Field values. So does a bigger cube, such as a 1/2" cube ( B888), 1" cube (BX0X0X0), or even a monster 2" cube ( BY0Y0Y0). For example, a 1/4" cube ( B444) has a Surface Field of 5754 Gauss. The magnitude of the magnetic field (B) is more a function of the shape of the magnet than its size. Our specified values come from these theoretical formulas, backed up by many years of empirical testing of our magnets. Other methods include the use of FEA software, experimental measurement with a magnetometer, or a combination of both. It is a function of the shape of the magnet and the grade of magnetic material. For blocks, it is specified on the surface of the magnet, also along the center axis of magnetization.Ĭlick here for a depiction of the measurement locations.įor some shapes, the magnetic field strength along the central axis of the field can be calculated using known formulas. For axially magnetized discs and cylinders, we specify it on the surface of the magnet, along the center axis of magnetization. It is a measure of the magnetic field's effects on its environment. When specified on our site, the surface field or magnetic field refers to the strength of the B-field in Gauss. How can a monster 3" diameter disk have a lower field strength than a little refrigerator magnet? What's really counterintuitive is how some of our biggest, heavy lifting magnets often show some relatively low values for their Surface Field. We're often asked about why a particular magnet has a certain Surface Field value. Why does a bigger magnet have a lower Surface Field than a smaller one? That doesn't make any sense!
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