Download - The Physics of the IPod
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THE
IPod
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How does
it work ?!?!
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HOW IS IT SO
SMALL?
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WHERE DID ALL
THE INFO GO?
IT’S NOT BACK HERE!
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160GB =160 X
10^9 bytes
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THAT’S MORE THAN THE NUMBER OF HUMANS WHO HAVE EVER BEEN
ON THE FACE OF THE EARTH…
EVER!
IN HERE
http://www.prb.org/Articles/2002/HowManyPeopleHaveEverLivedonEarth.aspx
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IF EACH BIT WAS A RULER
http://neo.jpl.nasa.gov/glossary/au.html
AND YOU TOUCHED THEM END TO END.
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YOU COULD TOUCH A STAR IN THE CONSTELLATIONCENTAUR!
http://www.astro.wisc.edu/~dolan/constellations/constellations/Centaurus.html
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AND STILL HAVE ENOUGH TO BUILD A BRIDGE OF RULERS TO PLUTO THAT WOULD BE 1,642 RULERS WIDE.
http://www.physlink.com/education/askexperts/ae498.cfm
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AND THEN SOME, ALL IN THE
BOTTOM HALF OF THE IPOD
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HOW DO THEY DO IT?
?
?
?
?
?
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GMR
GIANT MAGNETORESISTANCE
ACRONYM= BIG
CONFUSING WORD
SCREAMING IS APPROPRIATE
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SIMPLYLet’s think about a sandwich
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THE BREAD IS MAGNETIZED IN THE SAME DIRECTION, THE PB&J IS NOT
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NOW, THINK ABOUT SHOOTING ELECTRONS THROUGH THE SANDWICH!
e- e- e- e-e- e- e- e-
e- e- e- e-e- e- e- e-
-----
-----
BUT WHAT HAPPENS IN THE SANDWICH?
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ABSTRACT IDEA
WARNING!!!OK, SO ELECTRONS HAVE THIS THING CALLED SPIN.
http://www.ahajokes.com/cartoon/sharp_edges.jpg
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KIND OF SIMILAR
TO A TOP,
OB
THEY SPIN, BUT NOT ALL IN THE SAME WAY.
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SOME WILL SPIN IN ONE DIRECTION TO THE MAGNETIC FIELD
OTHERS WILL SPIN IN ANOTHER DIRECTION TO THE MAGNETIC FIELD
www.pepperspollywogs.com/blog/wp-content/uplo
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THE PARALLEL
THE ANTI- PARALLEL
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THE TWO PIECES OF
BREAD ARE MAGNETIZED IN THE SAME DIRECTION
NORTH TO
NORTH
SOUTH TO
SOUTH
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THE ELECTRONS THAT ARE PARALLEL WILL PASS THROUGH WITH LITTLE RESISTANCE
SOME OF THE ANTI-PARALLEL
ELECTRONS WILL WILL BE DEFLECTED,
BUT OVERALL
LOW RESISTANCE
N N
S S
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BUT WHAT IF YOU FLIP ONE SIDE OF THE SANDWICH
UPSIDE DOWN?
N S
S N
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THE TOTAL RESISTANCE WILL BE HIGH
WHY?
http://mylifecomics.files.wordpress.com/2010/02/confused-face2.jpg
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THE MAGNETIC FIELD DEFLECTS BOTH TYPES OF SPIN
FEWER GO THROUGH THE SANDWICH
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It is very similar to a goalie on his game
http://2.bp.blogspot.com/_VrRxdJj53Js/SYXgP_C7p3I/AAAAAAAABKs/m8Eow4obCrQ/s1600/S0131no_call_w.jpg
Except the pucks are electrons
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But in a parallel field the goalie might be having an off night
http://www.boston.com/community/photos/raw/davis_goalie.jpg
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IN ENGLISH!
!?!?
YOU CAN CHANGE THE RESISTANCE OF ELECTRONS COMING OUT OF THE SANDWICH
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If you can change it
You can control it
http://sciencegeekgirl.com/files/2008/07/641px-mad_scientist_transparent_backgroundsvg.png
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HOW DOES THE I POD FIT INTO THIS ?
A BETTER QUESTION IS, HOW DOES THIS FIT INTO THE IPOD?
http://irononstation.com/Merchant2/graphics/thumbs/ironon/spiritual/spiritual4.jpg
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With special sensors, and using GMR effect, a computer is able to read tightly packed information on hard disks.
THAT MEANS MORE INFORMATION IN A SMALLER SPACE!
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1981 vs 2010
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; http://www.techrivet.com/resources/images/GigabyteComparison_20yago.jpg
1981
2010
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Without GMR the IPod would be about the size of a truck
Plus that giant rock.
http://farm4.static.flickr.com/3478/3458191128_bbc3b9745f.jpg
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You can thank : Albert Fert
http://www2.pictures.gi.zimbio.com/Nobel+Prize+Winners+Honoured+Elysee+Palace+0iwkxqDKptAl.jpg
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&Peter Grunberg
http://nobelprize.org/nobel_prizes/physics/laureates/2007/grunberg_museum_photo.jpg
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The 2 who discovered the GMR effect
IPod
With out them life sure would be different.
Cave man IPod
http://jelinek-art.cz/images/vedecke/vr020.jpg