scholarly journals Design and Micromagnetic Simulation of Fe/L10-FePt/Fe Trilayer for Exchange Coupled Composite Bit Patterned Media at Ultrahigh Areal Density

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Warunee Tipcharoen ◽  
Arkom Kaewrawang ◽  
Apirat Siritaratiwat
Keyword(s):  
Exchange Coupling ◽  
Single Layer ◽  
Areal Density ◽  
Interlayer Exchange Coupling ◽  
Magnetic Media ◽  
Recording Technology ◽  
Bit Patterned Media ◽  
Patterned Media ◽  
Interlayer Exchange ◽  
Exchange Coupled Composite

Exchange coupled composite bit patterned media (ECC-BPM) are one candidate to solve the trilemma issues, overcome superparamagnetic limitations, and obtain ultrahigh areal density. In this work, the ECC continuous media and ECC-BPM of Fe/L10-FePt/Fe trilayer schemes are proposed and investigated based on the Landau-Lifshitz-Gilbert equation. The switching field,Hsw, of the hard phase in the proposed continuous ECC trilayer media structure is reduced below the maximum write head field at interlayer exchange coupling between hard and soft phases,Aex, higher than 20 pJ/m and its value is lower than that for continuousL10-FePt single layer media andL10-FePt/Fe bilayer. Furthermore, theHswof the proposed ECC-BPM is lower than the maximum write head field with exchange coupling coefficient between neighboring dots of 5 pJ/m andAexover 10 pJ/m. Therefore, the proposed ECC-BPM trilayer has the highest potential and is suitable for ultrahigh areal density magnetic recording technology at ultrahigh areal density. The results of this work may be gainful idea for nanopatterning in magnetic media nanotechnology.

scholarly journals Micromagnetic Simulation of L10-FePt-Based Exchange-Coupled-Composite-Bit-Patterned Media with Microwave-Assisted Magnetic Recording at Ultrahigh Areal Density

Micromachines ◽  
2021 ◽  
Vol 12 (10) ◽  
pp. 1264
Author(s):  
Pirat Khunkitti ◽  
Naruemon Wannawong ◽  
Chavakon Jongjaihan ◽  
Apirat Siritaratiwat ◽  
Anan Kruesubthaworn ◽  
...  
Keyword(s):  
Magnetic Recording ◽  
Magnetic Domain ◽  
Hysteresis Loops ◽  
Areal Density ◽  
Bit Patterned Media ◽  
Patterned Media ◽  
Microwave Assisted ◽  
The Media ◽  
5 Ghz ◽  
Exchange Coupled Composite

In this work, we propose exchange-coupled-composite-bit-patterned media (ECC-BPM) with microwave-assisted magnetic recording (MAMR) to improve the writability of the magnetic media at a 4 Tb/in2 recording density. The suitable values of the applied microwave field’s frequency and the exchange coupling between magnetic dots, Adot, of the proposed media were evaluated. It was found that the magnitude of the switching field, Hsw, of the bilayer ECC-BPM is significantly lower than that of a conventional BPM. Additionally, using the MAMR enables further reduction of Hsw of the ECC-BPM. The suitable frequency of the applied microwave field for the proposed media is 5 GHz. The dependence of Adot on the Hsw was additionally examined, showing that the Adot of 0.14 pJ/m is the most suitable value for the proposed bilayer ECC-BPM. The physical explanation of the Hsw of the media under a variation of MAMR and Adot was given. Hysteresis loops and the magnetic domain of the media were characterized to provide further details on the results. The lowest Hsw found in our proposed media is 12.2 kOe, achieved by the bilayer ECC-BPM with an Adot of 0.14 pJ/m using a 5 GHz MAMR.

Effects of Magnetic Properties of L10-CoPt based Bit Patterned Media with Tilted-Easy Axis on Switching Field at Areal Density over 2 Tb/in2

2015 ◽  
Vol 781 ◽  
pp. 207-210
Author(s):  
Arkom Kaewrawang
Keyword(s):  
Magnetic Properties ◽  
Easy Axis ◽  
Magnetocrystalline Anisotropy ◽  
Areal Density ◽  
Anisotropy Constant ◽  
Magnetic Media ◽  
Switching Field ◽  
Bit Patterned Media ◽  
Patterned Media ◽  
Easy Direction

Decrease of a switching field, Hsw, of the magnetic media with high magnetocrystalline anisotropy constant, Ku, can be handled by tilted-easy axis. Not only tilting easy direction of crystal but also optimum magnetic properties can improve writability. The effects of Ku and saturation magnetization, Ms, of L10-CoPt material of BPM with 45° tilted-easy axis are investigated in this article. The object oriented micromagnetic framework package based on Landau - Lifshitz - Gilbert equation has been used to analyze the magnetic properties of media in this paper. The results indicate that the Hsw decreases with decreasing Ku and increasing Ms. To achieve the Hsw lower than the maximum write head field, the Ku and Ms values should not be over 1.30 MJ/m3 and should exceed 0.30 MA/m, respectively.

The influence of interlayer exchange coupling on magnetic ordering in Fe/V superlattices

2009 ◽  
Vol 321 (9) ◽  
pp. 1214-1220 ◽  
Author(s):  
M. Marcellini ◽  
M. Pärnaste ◽  
B. Hjörvarsson ◽  
G. Nowak ◽  
H. Zabel
Keyword(s):  
Exchange Coupling ◽  
Magnetic Ordering ◽  
Interlayer Exchange Coupling ◽  
Interlayer Exchange

Dynamic interlayer exchange coupling in magnetic anisotropic FeCoB/Ru/FeCoB sandwich trilayers

2021 ◽  
Vol 527 ◽  
pp. 167801
Author(s):  
Chunmei Wang ◽  
Shouheng Zhang ◽  
Yicong Huang ◽  
Tao Sang ◽  
Derang Cao ◽  
...  
Keyword(s):  
Exchange Coupling ◽  
Interlayer Exchange Coupling ◽  
Interlayer Exchange

ChemInform Abstract: Layered Magnetic Structures: Interlayer Exchange Coupling and Giant magnetoresistance

ChemInform ◽  
2010 ◽  
Vol 26 (32) ◽  
pp. no-no
Author(s):  
A. FERT ◽  
P. GRUENBERG ◽  
A. BARTHELEMY ◽  
F. PETROFF ◽  
W. ZINN
Keyword(s):  
Exchange Coupling ◽  
Giant Magnetoresistance ◽  
Interlayer Exchange Coupling ◽  
Magnetic Structures ◽  
Interlayer Exchange

Antiferromagnetic interlayer exchange coupling in epitaxial Fe/MgO/Fe trilayers with MgO barriers as thin as single monolayers

2014 ◽  
Vol 115 (10) ◽  
pp. 104301 ◽  
Author(s):  
A. Kozioł-Rachwał ◽  
T. Ślęzak ◽  
M. Ślęzak ◽  
K. Matlak ◽  
E. Młyńczak ◽  
...  
Keyword(s):  
Exchange Coupling ◽  
Interlayer Exchange Coupling ◽  
Interlayer Exchange

scholarly journals The impact of number of repeats N on the interlayer exchange in $$[\text {Fe/MgO}]_{N} $$(001) superlattices

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Tobias Warnatz ◽  
Fridrik Magnus ◽  
Nanny Strandqvist ◽  
Sarah Sanz ◽  
Hasan Ali ◽  
...  
Keyword(s):  
Quantum Well ◽  
Exchange Coupling ◽  
Neutron Reflectometry ◽  
Interlayer Exchange Coupling ◽  
Magnetic Switching ◽  
Interlayer Exchange ◽  
Quantum Well States ◽  
The Impact ◽  
Polarized Neutron Reflectometry ◽  
Mgo Layers

AbstractThe strength of the interlayer exchange coupling in [Fe/MgO]$$_N$$ N (001) superlattices with 2 ≤ N ≤ 10 depends on the number of bilayer repeats (N). The exchange coupling is antiferromagnetic for all the investigated thicknesses while being nine times larger in a sample with N = 4 as compared to N = 2. The sequence of the magnetic switching in two of the samples (N = 4, N = 8) is determined using polarized neutron reflectometry. The outermost layers are shown to respond at the lowest fields, consistent with having the weakest interlayer exchange coupling. The results are consistent with the existence of quantum well states defined by the thickness of the Fe and the MgO layers as well as the number of repeats (N) in [Fe/MgO]$$ _{N}$$ N (001)superlattices.

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