BEGIN:VCALENDAR VERSION:2.0 PRODID:-//jEvents 2.0 for Joomla//EN CALSCALE:GREGORIAN METHOD:PUBLISH BEGIN:VEVENT UID:6ab28736f3d6eb281002457efd0352e2 CATEGORIES:Lectures & Presentations CREATED:20160427T150240 SUMMARY:Vortrag Kazuhiro Hono IEEE Distinguished Lecturer "Materials challenges for next generation high-density magnetic recording - media and readers" LOCATION:TU Wien (48°12'02.2"N 16°21'49.2"E) Getreidemarkt 9\, 1060 Vienna Seminar r oom TUtheSky (11th floor) DESCRIPTION:
Hosts: Josef Fidler (TU-Wien), Thomas Schrefl (Donau-Uni Krems), Dieter
Süss (TU-Wien)
Time: Friday, May 6th, 2016, 2:00 PM
Location: TU
Wien (48°12'02.2"N 16°21'49.2"E)
Getreidemarkt 9, 1060 Vienna
Sem
inar room TUtheSky (11th floor)
The hard disk drive industry is
making continuous efforts to increase the areal density of
magnetic r
ecording. To realize an areal density of higher than 2 Tbit/in2 in the futu
re, both
media and readers need technical breakthroughs. Since the bit
size will be in the range of 20
nm, the magnetic grains in the record
ing media must be reduced to less than 6 nm, requiring
the use of ferr
omagnetic materials with high magnetocrystalline anisotropy such as L10 FeP
t.
The shield-to-shield spacing of read sensors must also be smaller t
han 20 nm with low device
resistance (resistance-area product RA~0.1 ?
?m2), which is very difficult to achieve using
MgO based tunneling mag
netoresistance devices. In this talk, we will address the materials
ch
allenges to the realization of an ideal media nanostructure using L10 FePt
for heat-assisted
magnetic recording (HAMR) media and narrow readers f
or > 2 Tbit/in2 areal density. Recently
significant progress has been
made in current-perpendicular-to-plane giant magnetoresistive
(CPP-GMR
) devices using highly spin-polarized Heusler alloy ferromagnetic layers an
d new
spacer materials. The very high magnetoresistance ratios achieve
d in CPP-GMR are
encouraging for future read head applications of CPP-
GMR, or its laterally extended version,
lateral spin valves. The devic
es with high magnetoresistive output at low RA may open new
applicatio
ns in addition to disk read heads.