Institute of Physics Polish Academy of Sciences Warsaw ... file> patterned media for magnetic data...
Transcript of Institute of Physics Polish Academy of Sciences Warsaw ... file> patterned media for magnetic data...
![Page 1: Institute of Physics Polish Academy of Sciences Warsaw ... file> patterned media for magnetic data storage (suppression of superparamagnetism, increase of density storage, multilevel](https://reader033.fdocuments.in/reader033/viewer/2022041500/5e2173a5eb3fd77f0c5c1fcb/html5/thumbnails/1.jpg)
Institute of Physics Polish Academy of Sciences Warsaw, Poland
Division of Physics of Magnetism: ON – 3 http://www.ifpan.edu.pl/index_en.php
Group of Magnetic Heterostructures
Scientific profile: Physics of magnetism of metallic magnetic ultrathin films, multilayers and nanostructures (dots, wires, magnonic crystals)
Andrzej Wawro [email protected] http://info.ifpan.edu.pl/~wawro/
![Page 2: Institute of Physics Polish Academy of Sciences Warsaw ... file> patterned media for magnetic data storage (suppression of superparamagnetism, increase of density storage, multilevel](https://reader033.fdocuments.in/reader033/viewer/2022041500/5e2173a5eb3fd77f0c5c1fcb/html5/thumbnails/2.jpg)
1. Short introduction to magnetic patterning 2. Presentation of MBE for metallic structures 3. Brief review of scientific results > dots > magnonic crystals > coupled layers 4. Summary: possible applications
Outline
![Page 3: Institute of Physics Polish Academy of Sciences Warsaw ... file> patterned media for magnetic data storage (suppression of superparamagnetism, increase of density storage, multilevel](https://reader033.fdocuments.in/reader033/viewer/2022041500/5e2173a5eb3fd77f0c5c1fcb/html5/thumbnails/3.jpg)
Reasons for nanomagnetic system investigations
> fundamental investigations of magnetism in nanoscale: - magnetic anisotropy due to impact of the interface and edge atoms - modifications of magnetic moments of atoms (magnetovolume effect) - Curie temperature - electron polarisation - spin wave propagation - interlayer coupling - electron spin scattering > layered coupled systems: spin valves, GMR > patterned media for magnetic data storage (suppression of superparamagnetism,
increase of density storage, multilevel storage) > sources of local magnetic fields for spintronic systems > magnetic quantum cellular automata for logic operations (MQCA) > magnonic crystals: a new type of metamaterial > sensors e.g. in biology: filters in cell cytometry and hyperthermia therapy
![Page 4: Institute of Physics Polish Academy of Sciences Warsaw ... file> patterned media for magnetic data storage (suppression of superparamagnetism, increase of density storage, multilevel](https://reader033.fdocuments.in/reader033/viewer/2022041500/5e2173a5eb3fd77f0c5c1fcb/html5/thumbnails/4.jpg)
Riber Prevac
MBE systems
![Page 5: Institute of Physics Polish Academy of Sciences Warsaw ... file> patterned media for magnetic data storage (suppression of superparamagnetism, increase of density storage, multilevel](https://reader033.fdocuments.in/reader033/viewer/2022041500/5e2173a5eb3fd77f0c5c1fcb/html5/thumbnails/5.jpg)
Prevac MBE system components:
- growth chamber - MOKE chamber - analysis chamber - ion gun chamber - SPM chamber - UHV: 1E-11 Torr
Prevac system
![Page 6: Institute of Physics Polish Academy of Sciences Warsaw ... file> patterned media for magnetic data storage (suppression of superparamagnetism, increase of density storage, multilevel](https://reader033.fdocuments.in/reader033/viewer/2022041500/5e2173a5eb3fd77f0c5c1fcb/html5/thumbnails/6.jpg)
> 12 pockets (in two electron guns) > 8 effusion cells > available materials: Ni, Co, Fe, Cr, W, Mo, Nb, Ta, V, Pt, Au, Ag, Cu > standard deposition rates: < 0.1 nm/s > RHEED (reflection high electron energy diffraction): crystalline structure > growth of single layers, multilayers, alloys and nanostructures > linear shutter : wedge- and step-like layers, double-wedge systems > sample holders: molyblocks 3” in diameter, temperature up to 1400 °C > standard substrates: 10 x 10 mm
Growth chamber
![Page 7: Institute of Physics Polish Academy of Sciences Warsaw ... file> patterned media for magnetic data storage (suppression of superparamagnetism, increase of density storage, multilevel](https://reader033.fdocuments.in/reader033/viewer/2022041500/5e2173a5eb3fd77f0c5c1fcb/html5/thumbnails/7.jpg)
> measuring configurations: PMOKE (polar; out-of-plane component) LMOKE (longitudinal; in-plane component; angular dependence) > scan over the sample surface > map of remnant magnetization (at H=0) > magnetic fields up to 3.8 kOe MOKE – magnetooptical Kerr effect
Co
MOKE magnetometry chamber
![Page 8: Institute of Physics Polish Academy of Sciences Warsaw ... file> patterned media for magnetic data storage (suppression of superparamagnetism, increase of density storage, multilevel](https://reader033.fdocuments.in/reader033/viewer/2022041500/5e2173a5eb3fd77f0c5c1fcb/html5/thumbnails/8.jpg)
> structural modifications of magnetic systems (interfaces and volume alloying) > noble gases: He, Ar (currently), Ne, Xe > energy range: up to 25 keV > fluences: 1e12 – 1e16 cm-2
> linear shutter: step- or wedge-like profiles of the dose > etching
Ion gun chamber
![Page 9: Institute of Physics Polish Academy of Sciences Warsaw ... file> patterned media for magnetic data storage (suppression of superparamagnetism, increase of density storage, multilevel](https://reader033.fdocuments.in/reader033/viewer/2022041500/5e2173a5eb3fd77f0c5c1fcb/html5/thumbnails/9.jpg)
> low energy electron diffraction (LEED): crystalline structure > Auger electron spectroscopy (AES): chemical composition; diffusional processes > direct heating stage for e.g. semiconducting substrate preparation > e-gun heating stage for sample heating up to 2000 °C
Analysis chamber
![Page 10: Institute of Physics Polish Academy of Sciences Warsaw ... file> patterned media for magnetic data storage (suppression of superparamagnetism, increase of density storage, multilevel](https://reader033.fdocuments.in/reader033/viewer/2022041500/5e2173a5eb3fd77f0c5c1fcb/html5/thumbnails/10.jpg)
Omicron VT SPM XA Series 50 – 500 K scanning probe microscopy (SPM) modes:
> atomic force microscopy (AFM): topography; all materials > magnetic force microscopy (MFM): magnetic domain structure > scanning tunnelling microscopy and spectroscopy (STM/STS): topography and local
electronic structure, only conducting materials
SPM chamber
![Page 11: Institute of Physics Polish Academy of Sciences Warsaw ... file> patterned media for magnetic data storage (suppression of superparamagnetism, increase of density storage, multilevel](https://reader033.fdocuments.in/reader033/viewer/2022041500/5e2173a5eb3fd77f0c5c1fcb/html5/thumbnails/11.jpg)
Co M
easy plane easy axis
M
Magnetization reorientation in thin films
Etot(θ) = -MSH(θ) + K1effsin2(θ) + K2sin4(θ) K1eff(d) = -2πMS
2 + KV + KSB/d + KSO/d
Model of uniaxial anisotropy
d
reorientation phase transition (RPT)
Components of magnetic anisotropy: > magnetocrystalline > magnetoelastic > surface > shape (dipolar)
![Page 12: Institute of Physics Polish Academy of Sciences Warsaw ... file> patterned media for magnetic data storage (suppression of superparamagnetism, increase of density storage, multilevel](https://reader033.fdocuments.in/reader033/viewer/2022041500/5e2173a5eb3fd77f0c5c1fcb/html5/thumbnails/12.jpg)
supe
rpar
amag
netic
Double wedge structures
M. Kisielewski et al., PRL 89 (2002) 087203
![Page 13: Institute of Physics Polish Academy of Sciences Warsaw ... file> patterned media for magnetic data storage (suppression of superparamagnetism, increase of density storage, multilevel](https://reader033.fdocuments.in/reader033/viewer/2022041500/5e2173a5eb3fd77f0c5c1fcb/html5/thumbnails/13.jpg)
Mo
Au
Co
Co
Idea of the magnetic dots induced by a patterned substrate
A. Wawro et al., PRB 83, 092405 (2011)
![Page 14: Institute of Physics Polish Academy of Sciences Warsaw ... file> patterned media for magnetic data storage (suppression of superparamagnetism, increase of density storage, multilevel](https://reader033.fdocuments.in/reader033/viewer/2022041500/5e2173a5eb3fd77f0c5c1fcb/html5/thumbnails/14.jpg)
Magnetic states of dots upon demagnetization
scan size 6 µm
tip: MESP-LM
dCo = 13.5 Å
dots magnetized „up” dots magnetized „down”
dots demagnetized in ac magnetic field with decreasing amplitude
E. Sieczkowska et al., IEEE Trans. Magn. 47, 2632 (2011)
![Page 15: Institute of Physics Polish Academy of Sciences Warsaw ... file> patterned media for magnetic data storage (suppression of superparamagnetism, increase of density storage, multilevel](https://reader033.fdocuments.in/reader033/viewer/2022041500/5e2173a5eb3fd77f0c5c1fcb/html5/thumbnails/15.jpg)
5 mm
10 m
m
(III)
(II)
(I)
Magnetic filtering
(III)
(II)
(I)
scan size: 20 µm
![Page 16: Institute of Physics Polish Academy of Sciences Warsaw ... file> patterned media for magnetic data storage (suppression of superparamagnetism, increase of density storage, multilevel](https://reader033.fdocuments.in/reader033/viewer/2022041500/5e2173a5eb3fd77f0c5c1fcb/html5/thumbnails/16.jpg)
A. Maziewski et al., Phys. Rev., B85 (2012) 054427
Structural modification of Pt/Co/Pt with Ga+ ion beam
Co
13
14
15
16 lo
g F
![Page 17: Institute of Physics Polish Academy of Sciences Warsaw ... file> patterned media for magnetic data storage (suppression of superparamagnetism, increase of density storage, multilevel](https://reader033.fdocuments.in/reader033/viewer/2022041500/5e2173a5eb3fd77f0c5c1fcb/html5/thumbnails/17.jpg)
1D magnonic crystals
PMOKE magnetization reversal
MFM
0 kOe
0.24 kOe
0.52 kOe
TRIDYN simulations
![Page 18: Institute of Physics Polish Academy of Sciences Warsaw ... file> patterned media for magnetic data storage (suppression of superparamagnetism, increase of density storage, multilevel](https://reader033.fdocuments.in/reader033/viewer/2022041500/5e2173a5eb3fd77f0c5c1fcb/html5/thumbnails/18.jpg)
J. Kisielewski et al. J. Appl. Phys. 115, 053906 (2014)
Structural modification of Pt/Co/Pt with laser beam
![Page 19: Institute of Physics Polish Academy of Sciences Warsaw ... file> patterned media for magnetic data storage (suppression of superparamagnetism, increase of density storage, multilevel](https://reader033.fdocuments.in/reader033/viewer/2022041500/5e2173a5eb3fd77f0c5c1fcb/html5/thumbnails/19.jpg)
Interlayer magnetic coupling in Mo/Co bilayers
![Page 20: Institute of Physics Polish Academy of Sciences Warsaw ... file> patterned media for magnetic data storage (suppression of superparamagnetism, increase of density storage, multilevel](https://reader033.fdocuments.in/reader033/viewer/2022041500/5e2173a5eb3fd77f0c5c1fcb/html5/thumbnails/20.jpg)
Summary: towards applications …
Wedged magnetic layers: - cancer cell (containing magnetic nanoparticles) filtering by domain wall movement
for hyperthermia therapy Magnetic dots: - elements of patterned media with perpendicular storage - multilevel magnetic storage (dot – matrix composite) - filter in cell cytometry Patterned structures by ion and laser beams: - magnonic crystals: a new type of metamaterials with band structure that can be
reprogrammed during operation Coupled magnetic layers: - GMR and spin valve effect - spatially patterned coupling: switchable magnonic crystals … and probably many other applications….
![Page 21: Institute of Physics Polish Academy of Sciences Warsaw ... file> patterned media for magnetic data storage (suppression of superparamagnetism, increase of density storage, multilevel](https://reader033.fdocuments.in/reader033/viewer/2022041500/5e2173a5eb3fd77f0c5c1fcb/html5/thumbnails/21.jpg)
Prof. L.T. Baczewski Prof. A. Wawro Dr. L. Gładczuk Dr. A. Petruczik E. Milińska A. Marynowska K. Lasek P. Misiuna M. Jakubowski P. Aleszkiewicz
IPPAS (IFPAN) group and cooperation
Dr. J. Kanak
Prof. A. Maziewski Dr. Z. Kurant Dr. P. Mazalski Dr. I. Sveklo Dr. J. Kisielewski Dr. M. Tekielak
Dr. A. Rogalev Dr. K. Ollefs
Dr. J. von Borany Dr. K. Potzger Dr. R. Boettger
Prof. J. Szade Dr. K. Balin
Dr. A. Bartnik
Prof. Th. Rasing Dr. A. Kirilyuk Dr. A. Kimel