Eko Rujito - Academia.edu (original) (raw)

Papers by Eko Rujito

Hollywood has been a center where art, dreams, fantasy, and technological advance are blended int... more Hollywood has been a center where art, dreams, fantasy, and technological advance are blended into one of the most influential products of popular culture, movies. The popularity of Hollywood movies has been thought as the result of professionally managed entertainment industry, backed up by the use of latest technology and massive advertisement. In fact, those factors play only on “the surface”; there is something more instrumental embedded in the psyche of both film makers and viewers that lead to the world-wide acceptance of Hollywood movies. Psychologist Carl Jung calls this element archetype. It resides in the unconscious layer of human psyche, regardless their cultural and geographical background. Archetypes are ever-present, mainly through any mode of narratives, though variation and modification occur from time to time. However, the essence of the archetypes are mostly invariable. This paper is aimed to reveal the presentation of hero archetypes in 2013 Hollywood action movi...

Physics of Metals and Metallography, 2021

The structure and magnetization dynamics are investigated in a vortex spin-transfer nanooscillato... more The structure and magnetization dynamics are investigated in a vortex spin-transfer nanooscillator, which is a three-layer spin-valve magnetic nanocolumn with a large diameter of 400 nm, under flowing spin-polarized current through it. The dynamic variation in the structure of vortices and their trajectory of motion are studied, using micromagnetic modeling, as a function of the value of the spin-polarized current. It is demonstrated that different modes of motion of vortices may exist: decaying oscillations of vortices, stationary oscillations of vortices, and the mode of switching polarity of one of vortices. The time for which different dynamic modes are settled is determined. The dependence of the oscillation frequency on the value of spin-polarized current is determined for the case of stationary dynamics of coupled vortices. It is shown that, at large values of current, switching of vortex polarity is only possible in a thick layer with the dynamic switching mechanism accompanied by generation of a vortex–antivortex pair. The software package for micromagnetic simulation, SpinPM, is used for numerical calculations of the dynamics of magnetic vortices.

Scientific Visualization, 2020

In the paper, we discuss the scheme and the prospects of holographic visualization for microwave ... more In the paper, we discuss the scheme and the prospects of holographic visualization for microwave scattering objects. At the core of our method is microwave registrationbased on spin diodes, to identify obstacles to the movement for the car's autonomous driving system. The resolution of the holographic system grows with wavelength decrease. However, the recording capacity at a given level of irradiating signal and diode noise decreases. We give an algorithm for the numerical reconstruction and visualization of obstacles. Estimates for the resolution and the reliability of object identification, depending on the distance to the obstacle, obtained by numerical modeling. We show that there is an optimal wavelength to reach the maximum distance of microwave recording, taking into account the system resolution and the acceptable signal level. Highly sensitive spin diodes, feasible for the 2-30 cm wavelength range, nearly approach the optimum range, which is ~ 0.5-1 cm for Schottky diodes, in their holographic visualization ability. Based on the Kotelnikov theorem for the sampling frequency of a harmonic signal, and on numerical experiments, the requirements for the placement density of the receiving elements of the recorder antenna array were determined depending on the distance to the object, the number of sensors and the recording window size. We show that a microwave-recording device based on spin diodes can be promising for an autonomous driving system in conditions of constrained movement with poor visibility and high noise.

Diksi, 2020

is widely considered the father of American modern poetry because of his revolutionary concept of... more is widely considered the father of American modern poetry because of his revolutionary concept of poetry writing. Whitman is a (political) thinker as much as a poet, and most notably, a democratic prophet. Through his abundant essays and poems, he preaches what he refers as aesthetic democracy. Employing descriptive-qualitative method, this paper aims at investigating the application of this concept in Whitman's most famous poem "Song of Myself". The result of the analysis shows that Whitman presents the concept of democracy of aesthetic in the both form and the content of the poem. The form of the poem signifies Whitman's rejection to the old poetic conventions and his aspiration of a more democratic poetic. The content of the poem shows a democratic tendency by involving various themes, subjects and personae with no privilege and subordination towards particular themes, subject or personae.

Spin electronic structure of graphene pi-states and Pt 5d-states for the Graphene/Pt interface ha... more Spin electronic structure of graphene pi-states and Pt 5d-states for the Graphene/Pt interface has been investigated. Here, we report a large induced spin-orbit splitting (~70-100 meV) of graphene pi-states with formation of non-degenerated Dirac-cone spin states at the K-point of the BZ crossed with spin-polarized Pt 5d-states at Fermi level that opens up a possibility for creation of new spintronics devices. We propose to use this spin structure for formation of spin current with spin locked perpendicular to the momentum for induced remagnetization of the (Ni-Fe)-nanodots arranged atop the interface. Theoretical estimations of the spin current created at the Graphene/Pt interface and the induced intrinsic effective magnetic field leading to the in-plane remagnetization of the NiFe-nanodots due to spin-orbit torque effect are presented. By micromagnetic modeling based on experimentally observed spin-orbit splitting we demonstarte that the induced intrinsic magnetic field might be e...

DIMENSIA: Jurnal Kajian Sosiologi, 2015

There have been abundant of studies on White Anglo-Saxon Protestant and its role in shaping Ameri... more There have been abundant of studies on White Anglo-Saxon Protestant and its role in shaping American culture. The assumption that America is an Anglo-Saxon Protestant nation is not entirely wrong, to certain extent, it is even indubitable. Anglo-Saxon Protestant culture and ethics have shaped America the nation it is today. This cannot be separated from the fact that the first settlers were people with Anglo-Protestant background. Through more than two hundred years of immigrations, however, when people from other parts of the globe with different cultural background and religious beliefs flooded America in huge number, this core culture did not vanish. It survived and was embraced by the majority of Americans. This paper tries to scrutinize the way the WASP identity became American identity. To do this, there are three basic ideas related to the WASP that need to be explored; the Anglo-Saxon ethnicity, Protestantism, and Anglo-conformity. In the first part it will try to investigat...

Physical Sciences Reviews, 2020

We present a theoretical study of the spin dynamics in perovskite-like multiferroics with homogen... more We present a theoretical study of the spin dynamics in perovskite-like multiferroics with homogeneous magnetic order in the presence of external magnetic and electric fields. A particular example of such material is BeFeO3 in which the spin cycloid can be suppressed by application of external magnetic field, doping or by epitaxial strain. Understanding the effect of the external electric field on the spin-wave spectrum of these systems is required for devices based on spin wave interference and other innovative advances of magnonics and spintronics. Thus, we propose a model for BiFeO3 in which the thermodynamic potential is expressed in terms of polarization \boldsymbol{P}, antiferrodistortion \boldsymbol{\Omega}, antiferromagnetic moment \boldsymbol{L} and magnetization \boldsymbol{M}. Based on this model, we derive the corresponding equations of motion and demonstrate the existence of electromagnons, that is, magnons that can be excited by electric fields. These excitations are cl...

Nanotechnology, 2020

The non-volatile spin-orbit torque magnetic random access memory (SOT-MRAM) is very attractive me... more The non-volatile spin-orbit torque magnetic random access memory (SOT-MRAM) is very attractive memory technology for the nearest future computers because of its various advantages such as non-volatility, high density and scalability. In the present work we propose a model of a graphene recording device for the SOT-MRAM unit cell consisting of a quasi-freestanding graphene intercalated with Au and an ultra-thin Pt layer sandwiched between graphene and a magnetic tunnel junction. As a result of using the claimed graphene recording memory element a faster operation and lower energy consumption will be achieved under the recording information by reducing the electric current required for record. The efficiency of the graphene recording element was confirmed by the experimental results and the theoretical estimations.

EPJ Web of Conferences, 2018

Interaction between magnetization dynamics and spin polarized electronic transport has been studi... more Interaction between magnetization dynamics and spin polarized electronic transport has been studied for ferromagnet nanodisk situated upon a 3D topological insulator (TI) film. Resonant magnetization dynamics leads to generation of spin current, which flows into the topological insulator, where spin to charge conversion occurs. Using micromagnetic simulations for magnetization dynamics we estimate the dc voltage, which is created due to this process in topological insulator. Contribution from different modes, which are characteristic for nanodisks, to the voltage was calculated.

Adabiyyāt: Jurnal Bahasa dan Sastra, 2010

This study examines Franklin Delano Roosevelt's four inaugural addresses to find out the cont... more This study examines Franklin Delano Roosevelt's four inaugural addresses to find out the continuity and change of American traditional value, namely individualism. This study is purely a library research based on textual interpretation of those inaugural addresses in revealing any continuity and change of American traditional value mentioned above. Applying an interdisciplinary andholistic approach, the writer attempts to analyze the continuity and change of American individualism values found in those inaugural addresses in the socio-cultural, historical and biographical contexts. This study begins with introductory notes, and then goes on to a discussion of the origins and significance of American individualism. The next part is a discussion on the continuity and change of American individualism found in those inaugural addresses, both textually and contextually. The study finds that there are continuity and change in the interpretation of American individualism expressed in t...

Physical Review Letters, 2019

Low Temperature Physics, 2017

The behavior of highly anisotropic f-d ferrimagnets in strong magnetic fields is studied. HoFexAl... more The behavior of highly anisotropic f-d ferrimagnets in strong magnetic fields is studied. HoFexAl12-x (x = 5,6) compounds, which have compensation temperatures Tcomp > 0 for x = 5 and Tcomp ≈ 0 K for x = 6, are used as examples. Magnetic phase diagrams for these substances in a two-sublattice (f-d) ferrimagnet with a compensation point are constructed and analyzed with exchange interactions and anisotropy taken into account. Special attention is devoted to the influence of the rare-earth anisotropy on the form and properties of the phase diagram.

Journal of Physics: Condensed Matter, 2016

Nanotechnologies in Russia, 2016

Thermally assisted magnetic random access memory (TAS-MRAM) nanodevices are promising candidates ... more Thermally assisted magnetic random access memory (TAS-MRAM) nanodevices are promising candidates for future memory applications, because they provide non-volatile data storage at fast operation and low energy consumption. In this work, we analyze operating regimes of these devices using macrospin and micromagnetic modeling. It is shown that, for the successful performance of write and read operations in a TAS-MRAM device, the intrinsic magnetic anisotropy of ferromagnetic layers must not exceed some critical value. The relationship between the device parameters and the value of critical magnetic anisotropy is explained using analytical model and proved by the results of numerical simulation. This analysis is important for the future downscaling of TAS-MRAM nanodevices.

Majalah Ilmiah Pembelajaran, Oct 10, 2012

Barbie doll has become an icon of American culture because she quickly and accurately represents ... more Barbie doll has become an icon of American culture because she quickly and accurately represents the values of American culture. This function can be run properly because of its flexible, adaptive, and fashionable character. She is not only a symbol of independence and freedom and representation of cultural materialism, but also an "historical record" the American social culture since the post-World War 2. She describes the social changes that occurred in America, even played a role in influencing social change is. Barbie also has a function as a representation of human demands to be an ideal figure, especially women, especially on matters that are completely material. This paper will try to elaborate the correlation of the doll and American ethics of selfreliance and materialism. By doing this, this paper assumes that there is an embodiment of values in Barbie Doll. In the last part of the discussion, the paper tries to trace the "global effect' of Barbie Doll and how it has shaped common perception of one of basic female desire; being beautiful.

A Collection of Extended Abstracts of the Nature Conference Frontiers in Electronic Materials, June 17 th to 20 th 2012, Aachen, Germany, 2013

Bulletin of the Lebedev Physics Institute, 2010