magnetic nanomembranes - leibniz gemeinschaft: start · feedback system for the emotor ......
TRANSCRIPT
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Denys Makarov
Magnetic Nanomembranes
M. Melzer, D. Karnaushenko, R. Streubel, F. Bahr, W. Hofmann, L. Baraban, I. Mönch, O. G. Schmidt
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II. Magnetic sensorics
I. Magnetism on curved surfaces (tubular and spherical structures)
Outline
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Kelley et al., Chem. Mater. (2004)
RFID-tags
Actuators
Kofod et al., Appl. Phys. Lett. (2007)
Displays
Sony (2007)
LEDs
New York Times (2009)
Solar cells
PowerFilm Solar (2010)
Arbitrary shapes after fabrication
Extended range of applications
Electronics become flexible
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Nature Mater. 9, 929 (2010); Nature Mater. 10, 316 (2011); Nano Lett. 11, 2522 (2011)
Electronics become flexible
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Nature Mater. 9, 929 (2010); Nature Mater. 10, 316 (2011); Nano Lett. 11, 2522 (2011)
Electronics become flexible
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Automotive applications drive sensor sales
Applications for magnetic sensors in today’s cars (iSuppli)
Number of magnetic sensors is 9 per car (in average)
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Consumer electronics and appliances
AMR sensors attach to the spray arm in a dishwasher to detect jamming
o Mobile phones
o White goods (washing machines, dishwashers, refrigerators, coffee machines)
o Personal electronics (cameras, camcorders, MP3 players)
o Audio / video / gaming
o Desktop and mobile PCs, external HDD
MEMS Industry GroupTM Newsletter
Courtesy Danby
Courtesy LAYAR
Electronic compass for cell phones
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Consumer electronics and appliances
AMR sensors attach to the spray arm in a dishwasher to detect jamming
o Mobile phones
o White goods (washing machines, dishwashers, refrigerators, coffee machines)
o Personal electronics (cameras, camcorders, MP3 players)
o Audio / video / gaming
o Desktop and mobile PCs, external HDD
MEMS Industry GroupTM Newsletter
Courtesy Danby
Courtesy LAYAR
Electronic compass for cell phones
Shapeable (magneto)electronics
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GMR multilayer element
20 to 50 double layers of ferro- and nonmagnetic conductors
Bext
↑
Giant Magneto-Resistance Current-in-plane measurement
Sensitive to in-plane fields GMR(Bext) = [R(Bext) – Rsat] / Rsat
[Co/Cu]50
GMR in exchange coupled multilayers
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GMR layers on Poly(dimethylsiloxan) (PDMS)
- by magnetron sputter deposition
Photolithographic patterning
on the PDMS coated wafer
compatible to established
micro-fabrication technologies
Four-point GMR measurement with
current-in-plane (CIP) configuration
Pealing the rubber film from the rigid silicon support
- by means of the anti-stick layer
GMR layer on a free-standing elastic membrane
Stretchable magnetoelectronics
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Field-dependent magnetoresistance:
GMR of [Co/Cu]50 multilayer stacks
GMR layer before peel-off
PDMS
GMR film
GMR(Bext) = [R(Bext) – Rsat] / Rsat
GMR measurements on free-standing films
Melzer et al., Nano Lett. 11, 2522 (2011)
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Field-dependent magnetoresistance:
GMR of [Co/Cu]50 multilayer stacks
GMR layer before peel-off
PDMS
GMR film
GMR(Bext) = [R(Bext) – Rsat] / Rsat
GMR measurements on free-standing films
GMR layer after peel-off
Melzer et al., Nano Lett. 11, 2522 (2011)
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s = 0 %
s = 0.8 %
s = 1.5 %
Piggyback setup for application of strain
Stretching of wrinkled GMR films
Melzer et al., Nano Lett. 11, 2522 (2011); Melzer et al., RSC Advances 2, 2284 (2012)
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Melzer et al., Adv. Mater. 24, 6468 (2012)
- Two different types of wrinkling occur on the rubber substrates
- High stretchability up to 29% of tensile strain
- Increasing resistance due to crack formation, GMR ratio changes only gradually
- Parallel wrinkles represent predetermined fracturing sites to create a
meander-like pattern during stretching
Spin valve sensor
Predetermined fracture pattern
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Melzer et al., Adv. Mater. 24, 6468 (2012)
- Two different types of wrinkling occur on the rubber substrates
- High stretchability up to 29% of tensile strain
- Increasing resistance due to crack formation, GMR ratio changes only gradually
- Parallel wrinkles represent predetermined fracturing sites to create a
meander-like pattern during stretching
Spin valve sensor
Predetermined fracture pattern
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Melzer et al., Adv. Mater. 24, 6468 (2012); www.lmts.epfl.ch; mariakonovalenko.wordpress.com
Spin valve sensor
Technology might be useful for the artificial muscles
Direct measurement of strain using magnetic sensorics
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Elastic GMR sensor for fluidic applications
Melzer et al., RSC Advances 2, 2284 (2012)
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Stretchable GMR sensors
Melzer et al., Nano Lett. 11, 2522 (2011)
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fahrrad-ro.de
buildaroo.com
o Angle positioning in rotary motors
Flexible magnetic field sensor provides:
o 3D magnetic field profile of eMotor
Optimization of the eMotor performance
Feedback system for the eMotor
sportrider.com integratedsoft.com
Measuring and Monitoring eMotors
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STATORPOLE
ROTOR < 500 µm
< 200 µm
(b)(a) 500 µm
Tomography of a commercial Hall sensor (TUD)
Commercially available Hall sensors are too thick to fit into the gap between stator and rotor
Thin and flexible Hall sensors
Flux control of magnetic bearings
Strong magnetic fields of ~20 kOe
Bismuth Hall sensors
Task: Increase of dynamic stiffness of
magnetic bearing systems
Flexible Hall sensors
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o All-flexible sensor
o No rigid components in the air gap
o Flexible PCB + magnetic sensor
STATORPOLE
ROTOR < 0.5 mm
< 0.2 mm
STATORPOLE
Rotor
Stator Sensor
Flexible Hall sensors
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Stretchable magnetoelectronics Fabrication of GMR powder
Step 1: Deposition of GMR stack on polymer Fabrication is the same as for stretchable
GMR sensors, but instead of pealing of
the substrate the polymer is dissolved in
acetone.
Step 2: Pealing GMR sensors of the substrate
GMR powder
GMR multilayers and Polymers
Melzer et al., Nano Lett. 11, 2522 (2011); Karnaushenko et al., Adv. Mater. 24, 4518 (2012)
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Stretchable magnetoelectronics Fabrication of GMR powder
Step 1: Deposition of GMR stack on polymer Fabrication is the same as for stretchable
GMR sensors, but instead of pealing of
the substrate the polymer is dissolved in
acetone.
Step 2: Pealing GMR sensors of the substrate
GMR powder Binder
GMR multilayers and Polymers
Melzer et al., Nano Lett. 11, 2522 (2011); Karnaushenko et al., Adv. Mater. 24, 4518 (2012)
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• Sensitivity • Ambient conditions
Paints
Pastes
Inks Magnetic powder
Binder solution
Fabrication and characterisation
Printable magnetoelectronics
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Karnaushenko et al., Adv. Mater. 24, 4518 (2012)
Magnetic sensor printed on various substrates
• Big and isotropic sensitivity
• Suitable electrical parameters
• Stable at ambient conditions
• Applicable to virtually any surface
• Flexibility and bendability
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Motivation
Resistors Capacitors LED`s Conductors
Printable electronics
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+ - + -
LED OFF
LED ON
Printed magnetic switch
Karnaushenko et al., Adv. Mater. 24, 4518 (2012)
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+ - + -
LED OFF
LED ON
Printed magnetic switch
Karnaushenko et al., Adv. Mater. 24, 4518 (2012)
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+ -
LED OFF
LED ON
Magnetic sensor +
Amplifier =
Magnetic Switch
Printed magnetic switch
Karnaushenko et al., Adv. Mater. 24, 4518 (2012)
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Elastic GMR sensor for fluidic applications
Melzer et al., RSC Advances 2, 2284 (2012)
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Rolled-up technology
Mei et al., Adv. Mater. 20, 4085 (2008)
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o Size of the sensor has to be adjusted to the size of the object
o Integration of the magnetic sensor in a microfluidic channel
o Rolled-up technology can be applied
Concept: rolled-up GMR sensor in fluidic channel
Mönch et al., ACS Nano 5, 7436 (2011)
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Single sensor elements are measured independently
o GMR ratio is slightly better for the planar sensor
o Sensitivity of the planar and rolled-up sensors is similar
Rolled-up sensor: Diameter: 60 um
Length: 1000 um
Planar vs. Rolled-up sensor
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In-flow detection of magnetic particles
o Successful in-flow (dynamic) detection of magnetic particles
o Size of particle is adjusted to the size of the channel
Mönch et al., ACS Nano 5, 7436 (2011) Collaboration: Larysa Baraban (IfWW-TUD);
Rolled-up magnetic sensor
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Magnetic nanoparticles in living cells
Co nanoparticles in SiO2 shell (80 nm) are uptaken
by living cells (HeLa)
Collaboration: Wang Xi, Samuel Sanchez (IIN-IFW); Larysa Baraban (IfWW-TUD)
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M. Kläui, J. Phys.: Cond. Mat. 20, 313001 (2008)
A. Brataas et al., Nature Materials 11, 372 (2012)
Head-to-head domain wall
Magnetic Vortex
Planar vs. Curved magnetic architectures
Head-to-head domain wall
M. Yan et al., Phys. Rev. Lett. 104, 057201 (2010)
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Tube of larger diameter
Head-to-head domain wall
Magnetic Vortex
Planar vs. Curved magnetic architectures
Head-to-head domain wall
M. Yan et al., Phys. Rev. Lett. 104, 057201 (2010)
Collaboration: Jehyun Lee (Seoul NU)
Init
ial s
tate
: ra
nd
om
Remanent magnetic state (unrolled tube)
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Collaboration: Rudolf Schäfer (IMM-IFW)
Head-to-head domain walls
Spiral-like domain walls
Azimuthal 180deg domains
SEM
M
agn
eto
-op
tica
l Ke
rr m
icro
sco
py
Magnetic pattern in a ferromagnetic rolled-up tube
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GMI effect
MI effect
Makhnovskiy et al., JMMM 276, 1866 (2004)
Circular magnetic domain structure
Transversal anisotropy
Longitudinal anisotropy
Hext
Magneto-impedance effect
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-15 -10 -5 0 5 10 15
-2
0
2
4
6
8
10
12
14
H
ext (mT)
s
0.1
10
1
00
f / M
Hz
Sensitivity
22 V/T
10 mA
Samples
5 mm
-15 -10 -5 0 5 10 15
-0,5
0,0
0,5
1,0
1,5
2,0
2,5
s
H
ext, (mT)
f / M
Hz
0.1
10
1
00
Sensitivity 2.7 V/T 10 mA
Planar sample Rolled-up sample
Py: 50 nm Cu: 200 nm Py: 50 nm SiO2: 500 nm SiO: 40 nm
Layer stack:
GMI in rolled-up architectures
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Human – Machine interface
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http://www.hondanews.com
GMI sensors for encephalography
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http://www.hondanews.com
GMI sensors for encephalography
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Processing steps:
• Lithography: define polymer strips
• Deposition: magnetic layer
• Delamination: self-assemble coils
Smith et al., Phys. Rev. Lett. 107, 097204 (2011); Smith et al., Soft Matter 7, 11309 (2011)
Fabrication of the coiled-up structures
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Saturated before coil-up
In-plane magnetized
perpendicular to strip
In-plane magnetized
Parallel to strip
Out-of-plane
magnetized
Achieved magnetization configurations
Smith et al., Phys. Rev. Lett. 107, 097204 (2011); Smith et al., Soft Matter 7, 11309 (2011)
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Hollow-bar-magnetized Corkscrew-magnetized Radial-magnetized
Magnetic configurations after coil-up
Saturated before coil-up
Achieved magnetization configurations
Smith et al., Phys. Rev. Lett. 107, 097204 (2011); Smith et al., Soft Matter 7, 11309 (2011)
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Möbius strip
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mx
x
y
z
Magnetic vortex state is stabilized similar to a tube
Magnetic Vortex
Geometry: radius = 300 nm, width = 300 nm, thickness = 30 nm
Möbius strip
Collaboration: Volodymyr Kravchuk (BITP)
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mx
Easy-axis anisotropy (K = 5x105 J/m3; Ms = 1 T) normal to the surface
Geometry: radius = 300 nm, width = 300 nm, thickness = 30 nm
x
y
z
Tube is radial-magnetized
mx
3 domain walls 1
2 3
Out-of-plane magnetized Möbius strip
Collaboration: Volodymyr Kravchuk (BITP)
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II. Magnetic sensorics
I. Magnetism on curved surfaces (tubular and spherical structures)
Summary
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I would like to thank:
Institute for Integrative Nanosciences; Carmine Ortix, Jeroen van den Brink (ITF); Rudolf Schäfer, Volker Neu, Ulrike Wolff, Sebastian Fähler (IMW); Mark H. Rümmeli, Alicia Bachmatiuk, Anja Wolter (IFF)
Michael Melzer, Robert Streubel, Tobias Kosub, Gungun Lin, Daniil Karnaushenko, Dmitriy Karnaushenko, Ingolf Mönch, Martin Kopte, Milan Pesic, Luyang Han, Irina Fiering, Cornelia Krien, Rainer Kaltofen, Alexander Kopylov
Falk Bahr, Wilfried Hofmann (EMA); Thomas Zerna (IAVT); Larysa Baraban, Gianaurelio Cuniberti (IfWW)
Acknowledgement
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MAGNA group at the IFW Dresden