IRFU presentationA. Persson

ver. 1.0 16/5/11

Magnetoresistance and space

Anders PerssonÅngström Space Technology Centre

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IRFU presentationA. Persson

Why magnetism and space?

• Jan Bergman• Very common satellite

instrument• Attitude control• Space plasma physics

2 kg

0,79 g

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IRFU presentationA. Persson

Why small?

• The Space Shuttle ~74 ton• A launch required

– 2000 ton of fuel – 2.9 billion SEK

• A nanosatellite weighs <10 kg • A launch requires

– 50 000-100 000 SEK/kg – Piggy-back launches

possible

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IRFU presentationA. Persson

87 n

m

• 1 nm = 0,000000001 m• 1 atom ≈ 0,1-0,2 nm

How small?

1 nm

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IRFU presentationA. Persson

How small is small?

• 1 µm = 1000 nm• Ø human hair ≈ 100 µm

Kreussenglas-kryssningsrobot

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IRFU presentationA. Persson

How is it done?

Pattern the sensors

Isolation

Contacts

ESC

AFI

B

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IRFU presentationA. Persson

Why is it difficult?

• Patterning the sensors

ImplantationRedeposition

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IRFU presentationA. Persson

How did it go?

• Implantation– A study of the effects– Optimization of the

process• Redeposition

– Stop the etch in the barrier

– 5-10 ggr more signal

• Radiation– Equivalent to a Jupiter

mission– No effects at all!

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IRFU presentationA. Persson

What’s next?

• Vietnamese satellite F-1• Weighs 1 kg • Launch during, 2012

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IRFU presentationA. Persson

…and also

• Planar Hall effect senors• New type of sensor geometry• A complement at low frequencies

60 n

m

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IRFU presentationA. Persson

Promising performance

Sensitivity Detection limit Scalability

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IRFU presentationA. Persson

The next generation

• New optimized design• 100 pTHz-0.5 @ 0.1 Hz• 30 pTHz-0.5 @ f>10 Hz

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IRFU presentationA. Persson

Tack!