THE

IPod

How does

it work ?!?!

HOW IS IT SO

SMALL?

WHERE DID ALL

THE INFO GO?

IT’S NOT BACK HERE!

160GB =160 X

10^9 bytes

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

IF EACH BIT WAS A RULER

http://neo.jpl.nasa.gov/glossary/au.html

AND YOU TOUCHED THEM END TO END.

YOU COULD TOUCH A STAR IN THE CONSTELLATIONCENTAUR!

http://www.astro.wisc.edu/~dolan/constellations/constellations/Centaurus.html

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

AND THEN SOME, ALL IN THE

BOTTOM HALF OF THE IPOD

HOW DO THEY DO IT?

?

?

?

?

?

GMR

GIANT MAGNETORESISTANCE

ACRONYM= BIG

CONFUSING WORD

SCREAMING IS APPROPRIATE

SIMPLYLet’s think about a sandwich

THE BREAD IS MAGNETIZED IN THE SAME DIRECTION, THE PB&J IS NOT

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?

ABSTRACT IDEA

WARNING!!!OK, SO ELECTRONS HAVE THIS THING CALLED SPIN.

http://www.ahajokes.com/cartoon/sharp_edges.jpg

KIND OF SIMILAR

TO A TOP,

OB

THEY SPIN, BUT NOT ALL IN THE SAME WAY.

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

THE PARALLEL

THE ANTI- PARALLEL

THE TWO PIECES OF

BREAD ARE MAGNETIZED IN THE SAME DIRECTION

NORTH TO

NORTH

SOUTH TO

SOUTH

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

BUT WHAT IF YOU FLIP ONE SIDE OF THE SANDWICH

UPSIDE DOWN?

N S

S N

THE TOTAL RESISTANCE WILL BE HIGH

WHY?

http://mylifecomics.files.wordpress.com/2010/02/confused-face2.jpg

THE MAGNETIC FIELD DEFLECTS BOTH TYPES OF SPIN

FEWER GO THROUGH THE SANDWICH

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

But in a parallel field the goalie might be having an off night

http://www.boston.com/community/photos/raw/davis_goalie.jpg

IN ENGLISH!

!?!?

YOU CAN CHANGE THE RESISTANCE OF ELECTRONS COMING OUT OF THE SANDWICH

If you can change it

You can control it

http://sciencegeekgirl.com/files/2008/07/641px-mad_scientist_transparent_backgroundsvg.png

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

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!

1981 vs 2010

; http://www.techrivet.com/resources/images/GigabyteComparison_20yago.jpg

1981

2010

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

You can thank : Albert Fert

http://www2.pictures.gi.zimbio.com/Nobel+Prize+Winners+Honoured+Elysee+Palace+0iwkxqDKptAl.jpg

&Peter Grunberg

http://nobelprize.org/nobel_prizes/physics/laureates/2007/grunberg_museum_photo.jpg

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