MOKE RESULTS

JM16

100 micron square pads 50nm Ni/ C10-dithiol / 20nm Co

Line scan across Pad5

05-17-09

JM16

X Data

0 1000 2000 3000 4000 5000 6000 7000

Y D

ata

0

1000

2000

3000

4000

5000

6000

7000

5.0 5.5 6.0 6.5 7.0 7.5

Scans on this pad

2900 3000 3100 3200 3300 3400

21.2

21.4

21.6

21.8

22.05

10

15

20

9.0

9.2

9.4

9.6

9.8

6

7

8

6

7

8

2900 3000 3100 3200 3300 3400

Coe

rciv

ity

X position

1w s

at

2w s

at

outp

ut D

C

line

scan

DC

Y = 3070

7-point MOKEline scan

High-res. DCline scan

-200 -100 0 100 200

-10

0

10

1

-200 -100 0 100 200

-10

0

10

2

-200 -100 0 100 200

-10

0

10

3

-200 -100 0 100 200

-10

0

10

4

-200 -100 0 100 200

-10

0

10

5

-200 -100 0 100 200

-10

0

10

6

-200 -100 0 100 200

-10

0

10

7

2 plots

File reference: 050409-JM16-TenmaDirect-pad5line-R-10

-200 -100 0 100 200

-20

0

20

1

-200 -100 0 100 200

-20

0

20

2

-200 -100 0 100 200

-20

0

20

3

-200 -100 0 100 200

-20

0

20

4

-200 -100 0 100 200

-20

0

20

5

-200 -100 0 100 200

-20

0

20

6

-200 -100 0 100 200

-20

0

20

7

1 plots

-200 -150 -100 -50 0 50 100 150 200-30

-20

-10

0

10

20

30

1w/in

put

H (Oe)

down on pad up on pad down off pad up off pad

1w comparison – on the pad vs. off the pad

Observations

• Output DC intensity and 1ω signal show clear reductions on the pad. However, 2ω signal is barely changed (it has increased noise on the pad). Coercivity shows no change.

• These results are consistent with ferromagnetic coupling of the two layers.

• Still need to explain why the 1ω shows a larger change than the 2ω.

• A total of 10 pads were looked at on this sample. All showed similar behavior.

Individual hysteresis loops

“down” half of loop

“up” half of loop