Orders of magnitude (magnetic moment)

This page lists examples of magnetic moments produced by various sources, grouped by orders of magnitude. The magnetic moment of an object is an intrinsic property and does not change with distance, and thus can be used to measure "how strong" a magnet is. For example, Earth possesses an enormous magnetic moment, however we are very distant from its center and experience only a tiny magnetic flux density (measured in tesla) on its surface.

Knowing the magnetic moment of an object ($𝐦$) and the distance from its centre ($r$) it is possible to calculate the magnetic flux density experienced ($𝐁$) using the following approximation:

$𝐁\approx {\mu }_o\frac{𝐦}{2\pi r^3}$,

where ${\mu }_o$ is the constant of vacuum permeability.

Examples

Magnetic moment strength (from lower to higher orders of magnitude)

Factor (m2⋅A)	Value	Item
10−45	Template:Val	Unit of magnetic moment in the Planck system of units.
10−27	Template:Val	Magnetic moment of a deuterium nucleus
10−26	Template:Val	Magnetic moment of a proton
10−24	Template:Val	Magnetic moment of a positron
	Template:Val	Bohr magneton
10−18	0.65–2.65 nm2⋅A (1 nm2⋅A = 10−18 m2⋅A)	Magnetic moment of individual magnetite nanoparticles (20 nm diameter)
10−11	Template:Val	Magnetic field of the human brain
	Template:Val
10−5	Template:Val	NIST YIG (yttrium iron garnet) standard 1 mm sphere for calibrating magnetometers (SRM #2852)
10−4	Template:Val	Needle in a thumbnail-sized compass
10−3	Template:Val	Neodymium-iron-boron disc in a typical mobile phone
10−1	Template:Val	Magnetic field of a typical refrigerator magnet
	Template:Val	Neodymium-iron-boron (strongest grade) disc the same size as a US Penny
100	Template:Val	Neodymium-iron-boron N35 magnet of 1 cubic centimeter in volume
	Template:Val	Neodymium-iron-boron N52 magnet of 1 cubic centimeter in volume
103	Template:Val	A bowling ball made of neodymium-iron-boron (strongest grade)
106	Template:Val	Any magnet able to produce 1 tesla one metre away from its centre
1019	Template:Val	Magnetic field of Mercury
1020	Template:Val	Magnetic field of Ganymede
1022	Template:Val	Earth's magnetic field
1024	Template:Val	Magnetic field of Neptune
	Template:Val	Magnetic field of Uranus
1025	Template:Val	Magnetic field of Saturn
1027	Template:Val	Magnetic field of Jupiter
1028	Template:Val	Magnetic moment of a star or, equivalently, a white dwarf or a magnetar
1029	Template:Val
1030	Template:Val

See also

• Orders of magnitude (magnetic flux density)