Prof. Dede Djuhana, M.Si., Ph.D., Dean of the Faculty of Mathematics and Natural Sciences (FMIPA) at the University of Indonesia (UI), was inaugurated as a Permanent Professor in the Field of Material Science at the Faculty of Mathematics and Natural Sciences, UI, on Wednesday (11/15) at the UI Depok Campus Convention Hall. The inauguration ceremony, which was broadcast live on UI’s YouTube channel and UI Television, was led by the UI Rector, Prof. Ari Kuncoro, S.E., M.A., Ph.D.
In a scientific speech entitled “Application of Micromagnetic Simulation in the Research of Structure and Domain Dynamics of Ferromagnetic Materials,” Prof. Dede stated that data storage devices have become a crucial need for documentation purposes in today’s digital era. Data storage devices of this type… hard-disk drive (HDD) is a popular type of data storage device due to its affordability, large capacity, and long-term durability. In general, HDDs remain popular, even though many other types are now being used. solid-state drive (SSD) as data storage.
Prof. Dede sees challenges in the process of recording magnetic media or magnetic recording in the future. The challenges are in the form of writability, signal-to-noise, And thermal stability. In addition, magnetic media recording using conventional technology has a capacity limit, which is an average of 1 Tb/in2.
To increase the magnetic recording capacity, new innovations can be created by using patterned-media, assisted-thermal or solid state. High capacity density of magnetic media recording can be achieved by reducing the size grainHowever, this reduction in size will have an impact on the magnetization. grain become unstable or known as super paramagnetic limit (SPM).
Magnetization grain It changes so easily from one state to another due to the influence of temperature. Magnetization time transition grain in the SPM area it is known as Néel relaxation time. This means that if you are able to control the magnetization conditions against thermal fluctuations in grain, the magnetization stability in the SPM region can be obtained.
“In 2008, a research group from IBM Almaden, USA led by Stuart Parkin published a magnetic recording device called Racetrack memory (RM). Devais RM berupa solid-state memory, non-volatile, and become an alternative to replace the role of SSD in the future. The ability to control the effects Walker breakdown and Joule heating “It is a challenge to develop devices so that the domain structure is stable,” said Prof. Dede.
According to him, one of the tool important in magnetic domain structure research is simulation micromagnetic. Micromagnetic is a field of magnetism that studies the dynamic structure of magnetic domains using a magnetic approach. Continuum to explain the properties and dynamics of magnetic domain structures. In the last two decades, simulation results micromagnetic greatly assist researchers in analyzing ferromagnetic domain structures. Therefore, in his research, Prof. Dede conducted simulations micromagnetic by using several models, namely the ball model, the model nanowire straight, and nanowire notch, to observe the structure and dynamics of magnetic domains of ferromagnetic materials. Simulations under conditions ground state provides information on the transition of domain structures from single-domain (SD) menjadi multi-domain (MD) of the system energy profile, such as demagnetization energy and exchange.
Prof. Dede’s research on simulation applications micromagnetic This is one of the many studies he has conducted. Some of them are Investigation of Harmonic and in Harmonic Domain Wall Oscillation by Sinusoidal Magnetic Field in the Notched Permalloy Nanowire using Micromagnetic Approach (2023); Single-step Laser Ablation Synthesis of ZnO–Ag Nanocomposites for Broad-Spectrum Dye Photodegradation and Bacterial Photoinactivation (2023); dan Femtosecond Laser-Induced Photochemical Synthesis of Gold Nanoparticles in Nitrate Solution (2022).
Prof. Dede Djuhana, M.Sc., Ph.D. completed his undergraduate (1999) and postgraduate (2003) degrees in the Department of Physics, Faculty of Mathematics and Natural Sciences, University of Indonesia. He earned his Ph.D. from the Department of Physics, College of Science, Chungbuk National University, Cheongju, South Korea (2009). Prior to serving as Dean of Faculty of Mathematics and Natural Sciences, University of Indonesia, he served as Director of Research and Development at the University of Indonesia from 2020 to 2022.
The inauguration procession of Prof. Dede as a professor was also attended by the Dean of the Faculty of Mathematics and Natural Sciences, Jakarta State University, Prof. Dr. Muktiningsih, M.Si.; the Dean of the Faculty of Mathematics and Natural Sciences, ITB/HFI, Prof. Wahyu Srigutomo; the Head of the Magnetic Materials and Nanoparticles Research Group, Center for Advanced Materials Research, BRIN, Prof. Dr. Wisnu Ari Adi; the Chairman of the Indonesian Magnetic Society, Prof. Agustinus Agung Nugroho Sulistyo Hutomo; the Head of STMKG, Dr. Suko Prayitno Adi; and the President Commissioner of PT Luas Birus Utama, Dr. Ir. Harris Susanto, S.Si., M.Hum.
