Micro Magnets

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Our supplier specialized in the production of micromagnets for the watch industry, Quick-Ohm is also
striving to conquer other industries. Numerous instruments in dashboards of automobiles
and aircrafts are equipped with stepper motors applications containing Quick-Ohm
micromagnets.
Micromagnets are also used in dental prothesis and implants.

Magnets made of Rare-Earth Cobalt

Micro magnets (Rare-Earth Permanent Magnets).

As a supplier of the famous Swiss watch industry, Quick-Ohm's skills for these products are based on a longtime experience. We provide solutions for a variety of technical problems, especially where high energies within smallest dimensions are required.
Besides watch magnets, Quick-Ohm also provides permanent micromagnets for industrial applications. (Special magnet materials with different energy products and material properties are available on request).
Demagnetization curves of the most common materials used by Quick-Ohm:

Magnets made of Samarium Cobalt 5 (SmCo5)

This alloy is best suited where little space is available and maximum energy is required. SmCo5 is little sensitive to corrosion and may be used to temperatures up to 250 degrees Celsius.
On request, Quick-Ohm provides coating of the magnets.
You have a choice of:
- tin, nickel, gold
- parylene and other plastic based coatings.
For absolute tightness and biocompatibility, magnets may be first covered by a layer of tin followed by gold and a final layer of parylene. This provides best possible protection to corrosion.

Magnets made of Samarium Cobalt 5-K

(SmCo5-K plastic bonded)
This alloy was developed for applications where difficult shapes are required. This material has good machineability for small and complex shapes showing less edge chipping compared to the pure SmCo. To top its advantages, the price/performance ratio is highly competitive.
Due to the plastic bonding, its energy product is much reduced compared to pure SmCo. Furthermore, this alloy’s maximum working temperature shall not exceed 80 degrees Celsius.

Material Cade	Remance		Coercivity				Energy density		Max. continuous temp.
	B. type Tesla kG	B. min Tesla kG	H type kA/m kOe	H min kA/m kOe	H type kA/m kOe	H min kA/m kOe	(BH)_max type kJ/m³ MGOe	(BH)_max min kJ/m³ MGOe	T_max C°
REPM 180/100	1.01	0.98	1500	100	755	710	200	180
REPM 180/100	10.1	9.8	19	12.5	9.5	8.8	25	23	250
REPM 160/120	0.95	0.90	1800	1200	720	660	180	160
REPM 160/120	9.5	9.0	22.5	15	9.0	8.3	23	20	250
REPM 140/200	0.90	0.85	2400	2000	660	600	160	140
REPM 140/200	9.0	8.5	30	25	8.3	7.5	20	18	250
REMP 60 K/100	0.64	0.55	1500	1000	500	420	80	60	80

Magnets made of Samarium 2 Cobalt 17 (Sm2Co17)

This alloy provides the highest energy density and good resistance to high temperature (300 degrees Celsius). It is the first choice for small dimensional applications requiring high energy in a high temperature environment.
However, its material structure is not suitable for complex geometrical shapes.

Material Code	Remanence		Coercivity				Energy density		Max. continuous temp.
	B. type Tesla kG	B. min Tesla kG	H type kA/m kOe	H min kA/m kOe	H type kA/m kOe	H min kA/m kOe	(BH)_max type kJ/m³ MGOe	(BH)_max min kJ/m³ MGOe	T_max C°
REPM 200/64	1.12	1.05	800	640	730	600	240	200
REPM 200/64	11.2	10.5	10	8	9.2	7.5	30	25	300
REPM 190/159	1.10	1.03	2070	1590	820	720	225	190
REPM 190/159	11.0	10.3	26	20	10.3	9.0	28	24	350

Magnets made of Neodym-Iron-Boron (Nd-Fe-B)

This material provides the highest energy product and remanence currently available. As indicated by its name, this material contains iron and bor, two elements that are readily available. Neodym-Iron-Boron is less expensive than Samarium Cobalt material.
Certain alloys may be used in temperatures as high as 180 degrees Celsius. Due to the iron content this material is sensitive to corrosion thus requiring a coating or surface treatment.

Material Cade	Remance		Coercivity				Energy density		Max. continuous temp.
	B. type Tesla kG	B. min Tesla kG	H type kA/m kOe	H min kA/m kOe	H type kA/m kOe	H min kA/m kOe	(BH)_max type kJ/m³ MGOe	(BH)_max min kJ/m³ MGOe	T_max C°
REPM 285/80	1.30	1.23	1120	800	980	770	320	285
REPM 285/80	13.0	12.3	14	10	12.3	9.6	40	36	100
REPM 300/119	1.33	1.27	1360	1190	1010	950	340	300
REPM 300/119	13.3	12.7	17	15	12.70	11.9	43	38	120
REPM 245/143	1.23	1.16	1670	1430	930	850	285	245
REPM 245/143	12.3	11.6	21	18	11.7	10.6	36	31	150
REMP 275/143	1.28	1.22	1670	1430	980	910	320	275
REMP 275/143	12.8	12.2	21	18	12.3	11.4	40	34.5	150
REPM 225/215	1.16	1.10	2470	2150	880	820	255	225
REPM 225/215	11.6	11.0	31	27	11.1	10.3	32	28	180
REPM 170/302	1.00	0.95	3260	3020	760	690	190	170
REPM 170/302	10.0	9.5	41	38	9.6	8.7	24	21	210