<s>
The	O
Karlqvist	B-General_Concept
gap	I-General_Concept
or	O
Karlqvist	B-General_Concept
Field	I-General_Concept
is	O
an	O
electromagnetic	O
phenomenon	O
discovered	O
in	O
1953	O
by	O
the	O
Swedish	O
engineer	O
Olle	O
Karlqvist	O
(	O
1922-1976	O
)	O
,	O
which	O
is	O
important	O
in	O
magnetic	B-Architecture
storage	I-Architecture
for	O
computers	O
.	O
</s>
<s>
Karlqvist	O
discovered	O
the	O
phenomenon	O
while	O
designing	O
a	O
ferromagnetic	O
surface	O
layer	O
to	O
the	O
magnetic	B-General_Concept
drum	I-General_Concept
memory	I-General_Concept
for	O
the	O
BESK	B-Device
computer	O
.	O
</s>
<s>
Karlqvist	O
published	O
his	O
discovery	O
in	O
the	O
1954	O
paper	O
"	O
Calculation	O
of	O
the	O
magnetic	O
field	O
in	O
ferromagnetic	O
layer	O
of	O
a	O
magnetic	B-General_Concept
drum	I-General_Concept
"	O
at	O
KTH	O
Royal	O
Institute	O
of	O
Technology	O
in	O
Stockholm	O
.	O
</s>
