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Samarium Cobalt (SmCo) magnets are of the Rare Earth class, have been available since the early 1970's.  These magnets possess very high magnetic properties, excellent thermal stability, while remaining resistant to corrosion.  These characteristics make SmCo magnets ideal for applications requiring a resistance to wide-ranging temperatures and environments.  SmCo magnets are manufactured by sintering or compression bonding.  They are anisotropic and can only be magnetised in the direction of orientation.  In general, magnetising fields of approximately 30 to 45KOe are required to saturate SmCo magnets.

 

Feature of Sintered SmCo
  • The best temperature characteristics in the rare-earth magnet family
  • Manufactured by powder metallurgical process involving the sintering of powder under vacuum.
  • Both grades of SmCo5 and Sm2Co17, commonly referred to as 1:5 and 2:17 material are available.
  • Good corrosion resistance and no special surface treatment required excellent for compact designs where high working temperature is a major concern. Grinding and slicing operations possible

Application: applied to various electric motors, instruments, sensors, detectors, radar, and other high-tech equipment.

Attributes of Samarium Cobalt Material

  • High resistance to demagnetization
  • High energy (magnetic strength is strong for its size)
  • Good temperature stability
  • Expensive material (cobalt is market price sensitive)

 

Magnetic property parameters of Sintered Smco5

Material

Remanence
Br

Magnetic Coercivity
(Min) HcB

Intrinsic Coercivity
(Min) HcJ

Max.
Energy
Product
(BH) max

Curie
Temp.

Operating
Temp.

Temp.
Coefficient
of
Remanence

Intrinsic
Coercivity
Temp.
Coefficient

 
 

Typical

Min

Typical

[T]

[T]

[kA/m]

[kA/m]

[kJ/m3]

Tc

Tw

 α(Br)

α(Hcj)

[KGs]

[KGs]

[KOe]

[KOe]

[MGOe]

[ C ]

[ C ]

[%/C]

[%/C]

RECo5
119/127

0.83

0.81

620

1274

127

119

750

250

-0.04

-0.3

8.3

8.1

7.8

16

16

15

RECo5
135/127

0.87

0.84

645

1274

143

135

750

250

-0.04

-0.3

8.7

8.4

8.1

16

18

17

RECo5
151/127

0.92

0.89

680

1274

159

151

750

250

-0.04

-0.3

9.2

8.9

8.5

16

20

19

RECo5
159/127

0.95

0.93

710

1274

167

159

750

250

-0.04

-0.3

9.5

9.3

8.9

16

21

20

RECo5
175/119

0.98

0.96

730

1194

183

175

750

250

-0.04

-0.3

9.8

9.6

9.2

15

23

22

RE(Sm)Co5
151/104

0.92

0.89

680

1035

159

151

750

250

-0.04

-0.3

9.2

8.9

8.5

13

20

19

RE(Sm)Co5
159/104

 0.95

0.93

710

1035

167

159

750

250

-0.04

-0.3

9.5

9.3

8.9

13

21

20

RE(Sm)Co5
151/159

0.92

0.89

680

1592

159

151

750

250

-0.04

-0.3

9.2

8.9

8.5

20

20

19

RE(Sm)Co5
159/159

0.95

0.93

710

1592

167

159

750

250

-0.04

-0.3

9.5

9.3

8.9

20

21

20

RE(Sm)Co5
175/119

0.98

0.96

730

1194

183

175

750

250

-0.04

-0.3

9.8

9.6

9.2

15

23

22

Note: Curie temperature and temperature coefficient are for reference only.

 

Magnetic property parameters of Sintered Sm2co17

Material

Remanence
Br

Magnetic Coercivity
(Min) HcB

Intrinsic Coercivity
(Min) HcJ

Max.
Energy
Product
(BH) max

Curie
Temp.

Operating
Temp.

Temp.
Coefficient
of
Remanence

Intrinsic
Coercivity
Temp.
Coefficient

Typical

Min

Typical

 

[T]

[T]

[kA/m]

[kA/m]

[kJ/m3]

[]

[]

[%/]

[%/]

[KGs]

[KGs]

[KOe]

[KOe]

[MGOe]

RE2Co17
175/199

0.99

0.96

700

1990

183

175

820

350

-0.03

-0.2

9.9

9.6

8.7

25

23

22

RE2Co17
175/143

0.99

0.96

700

1433

183

175

820

350

-0.03

-0.2

9.9

9.6

8.7

18

23

22

RE2Co17
191/199

1.04

1.02

750

1990

199

191

820

350

-0.03

-0.2

10.4

10.2

9.4

25

25

24

RE2Co17
191/143

1.04

1.02

750

1433

199

191

820

350

-0.03

-0.2

10.4

10.2

9.4

18

25

24

RE2Co17
191/80

1.04

1.02

750

796-1273

199

191

820

350

-0.03

-0.2

10.4

10.2

9.4

10-16

25

24

RE2Co17
207/199

1.07

1.04

756

1990

215

207

820

350

-0.03

-0.2

10.7

10.4

9.5

25

27

26

RE2Co17
207/143

1.07

1.04

756

1433

215

207

820

350

-0.03

-0.2

10.7

10.4

9.5

18

27

26

RE2Co17
207/80

1.07

1.04

756

796-1273

215

207

820

350

-0.03

-0.2

10.7

10.4

9.5

10-16

27

26

RE2Co17
207/44

1.07

1.04

413-716

438-796

215

207

820

350

-0.03

-0.2

10.7

10.4

5.2-9

5.5-10

27

26

RE2Co17
222/199

1.1

1.08

788

1990

239

222

820

350

-0.03

-0.2

11

10.8

9.9

25

30

28

RE2Co17
222/143

1.1

1.08

788

1433

239

222

820

350

-0.03

-0.2

11

10.8

9.9

18

30

28

RE2Co17
222/80

1.1

1.08

788

796-1273

239

222

820

350

-0.03

-0.2

11

10.8

9.9

5.5-10

30

28

RE2Co17
222/44

1.1

1.08

413-716

438-796

239

222

820

350

-0.03

-0.2

11

10.8

5.2-9

5.5-10

30

28

RE2Co17
239/143

1.12

1.1

772

1433

255

239

820

350

-0.03

-0.2

11.2

11

9.7

18

32

30

RE2Co17
239/80

1.12

1.1

772

796-1273

255

239

820

350

-0.03

-0.2

11.2

11

9.7

10-16

32

30

RE2Co17
239/44

1.12

1.1

413-716

438-796

255

239

820

350

-0.03

-0.2

 


 
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