SmCo Magnets

Samarium-Cobalt magnets were developed in 1960. They are produced by pressing alloys to shape, then sintered. Two different compositions are available: SmCo5 and Sm2Co17 (with higher coercivity). Among the rare-earth magnets, it has the best Br temperature coefficient (-0,035%/°C) granting the absolute highest available induction above 150°C operating temperature.

Despite a higher cost than other magnetic materials, SmCo provides an outstanding combination of high energy, thermal stability and corrosion resistance.The typical final shapes such as blocks, cylinders, rings and arcs are obtained by cutting and grinding processes of pressed standard blocks or unitary compression pre-moulded part. Because of its high brittleness, it has to be handled and assembled with care to avoid chips and cracks.

SmCo
quality category

Remanece
(Br)

Coercivity force(HcB)

Coercivity force(HcJ)

Energy product
(BHmax)

Max. operating temperature



mT

KGs

KA/m

KOe

KA/m

KOe

KJ/m³

MGOe

°C

SmCo5

16


810-850

8.1-8.5

620-660

7.8-8.3

>1200

>15

110-127

14-16

250

SmCo5

18


850-890

8.5-8.9

660-700

8.3-8.8

>1200

>15

127-145

16-18

250

SmCo5

20


900-940

9.0-9.4

680-725

8.5-9.1

>1200

>15

145-160

18-20

250

SmCo5

22


920-960

9.2-9.6

710-750

8.9-9.4

>1200

>15

160-175

20-22

250

SmCo5

24


960-1000

9.6-10.0

730-770

9.2-9.7

>1200

>15

175-190

22-24

250

Sm2Co17

24


950-1020

9.5-10.2

700-750

8.7-9.4

>1433

>18

175-190

22-24

300

Sm2Co17

26


1020-1050

10.2-10.5

750-780

9.4-9.8

>1433

>18

190-207

24-26

300

Sm2Co17

28


1030-1080

10.3-10.8

756-796

9.5-10.0

>1433

>18

207-220

26-28

300

Sm2Co17

30


1080-1100

10.8-11.0

788-835

9.9-10.5

>1433

>18

220-240

28-30

300

Sm2Co17

26M


1020-1050

10.2-10.5

750-780

9.4-9.8

>955

>12

190-207

24-26

300

Sm2Co17

28M


1030-1080

10.3-10.8

756-796

9.5-10.0

>955

>12

207-220

26-28

300

Sm2Co17

30M


1080-1100

10.8-11.0

788-835

9.9-10.5

>955

>12

220-240

28-30

300

Sm2Co17

24H


950-1020

9.5-10.2

700-750

8.7-9.4

>1900

>25

175-190

22-24

350

Sm2Co17

26H


1020-1050

10.2-10.5

750-780

9.4-9.8

>1900

>25

190-207

24-26

350

Sm2Co17

28H


1030-1080

10.3-10.8

756-796

9.5-10.0

>1900

>25

207-220

26-28

350

Sm2Co17

30H


1080-1100

10.8-11.0

788-835

9.9-10.5

>1900

>25

220-240

28-30

350


The specific density of SmCo materials is at 8,3-8,5 g/cm³

Temperature coefficient of remanence Br: -0,03 %/°C  to -0,04 %/°C (for 20 °C to 100 °C)

Temperature coefficient of coercivity (HcJ): -0,25 %/°C to -0,3 %/°C (for 20 °C to 100 °C)

Curie temperature: 750-800 °C

A complete overview of the available magnet systems can be found in our Technical Data Sheet for SmCo material.