Post on 10-Jun-2015
description
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