[vc_row][vc_column][vc_column_text]Kelompok Bidang Keahlian (KBK) Fisika Material dan Instrumentasi, Departemen Fisika FMIPA Universitas Gadjah Mada kembali melaksanakan kegiatan Pengabdian kepada Masyarakat (PKM) pada Senin, 14 Juli 2025, di SMA Negeri 8 Yogyakarta. Kegiatan ini mengangkat tema Tahun Internasional Sains dan Teknologi Kuantum: Membangun Masa Depan Karier dan Finansial dengan Fisika dan dihadiri oleh sekitar 270 siswa kelas 11.

Acara PKM dibagi menjadi dua sesi kegiatan. Sesi pertama diawali dengan sambutan dari Ketua Departemen Fisika UGM, Prof. Dr.Eng. Edi Suharyadi, M.Eng., yang memperkenalkan Departemen Fisika UGM secara umum, mulai dari program studi, kegiatan penelitian, hingga peluang karier lulusan fisika. Untuk menyemarakkan suasana, para siswa diajak bermain games interaktif melalui platform Kahoot dengan pertanyaan seputar fisika dasar. Sesi ini disambut antusias oleh siswa-siswi SMA N 8 Yogyakarta yang bersemangat menjawab dan bersaing dalam suasana yang edukatif dan menyenangkan.

Selanjutnya, sesi talkshow menjadi inti dari kegiatan PKM kali ini, dipandu oleh moderator Dr.Sc. Ari Dwi Nugraheni, S.Si., M.Si. Narasumber utama, Prof. Dr.Eng. Kuwat Triyana, M.Si., memaparkan tentang pentingnya jiwa entrepreneur di bidang fisika dan membahas peluang kerja lulusan fisika, termasuk kesempatan berkarier di bidang semikonduktor di Taiwan. Beliau juga menyinggung program Fisika Industri yang ada di Departemen Fisika UGM, di mana mahasiswa dibekali kuliah berbasis industri dan diterjunkan langsung ke lapangan sebagai bentuk implementasi nyata ilmu fisika.

Dalam sesi lanjutan, Prof. Dr.Eng. Yusril Yusuf, S.Si., M.Si., M.Eng. menyampaikan informasi terkait fasilitas penelitian dan jejaring kerja sama internasional Departemen Fisika UGM. Kemudian, Dr.Eng. Ahmad Kusumaatmaja, S.Si., M.Sc. memberikan penjelasan mengenai Program Studi Fisika dan pengenalan Program International Undergraduate Program (IUP) Fisika. Sesi dilanjutkan dengan pemaparan dari Moh. Adhib Ulil Absor, S.Si., M.Sc., Ph.D., yang menyampaikan penjelasan menarik tentang bagaimana konsep kuantum bekerja dalam kehidupan sehari-hari.

Antusiasme peserta semakin terlihat dalam sesi tanya jawab. Salah satu siswa bertanya mengenai perbedaan antara jurusan MIPA dan Teknik, yang dijawab secara komprehensif oleh para narasumber, memberikan pemahaman yang lebih dalam tentang prospek dan keunikan masing-masing bidang.

Kegiatan PKM ini menjadi wujud nyata kontribusi Departemen Fisika UGM dalam mendekatkan dunia pendidikan tinggi kepada siswa sekolah menengah serta membuka wawasan tentang pentingnya sains fisika dalam membangun masa depan karier dan finansial di era teknologi kuantum.[/vc_column_text][/vc_column][/vc_row][vc_row][vc_column width=”1/2″][vc_gallery type=”flexslider_slide” interval=”3″ images=”15098,15097,15096,15095,15094″ img_size=”1040×580″ onclick=”img_link_large” css=”” title=”Dokumentasi Kegiatan”][/vc_column][vc_column width=”1/2″][vc_gallery type=”flexslider_slide” interval=”3″ images=”15093,15092,15091,15090,15089″ img_size=”1040×580″ onclick=”img_link_large” css=”” title=”PKM SMAN 8 Yogyakarta”][/vc_column][/vc_row]

Ni’matil Mabarroh, Taufikuddin Alfansuri, Nur Aji Wibowo, Nurul Imani Istiqomah, Rivaldo Marsel Tumbelaka, Edi Suharyadi

https://doi.org/10.1016/j.jmmm.2022.169645

Journal of Magnetism and Magnetic Materials

Volume 560, October 2022, 169645

Abstract

Exploration of magnetic nanoparticle labels for giant magnetoresistance (GMR) biosensing technology is crucial because their characteristics determine GMR-based sensor performance, related to their stray field and compatibility to biomolecule. We investigated the potency of the green-synthesized magnetite (Fe3O4) nanoparticle as a green-magnetic label on a spin-valve (SV) GMR sensor based on a [Ta (2 nm)/Ir20Mn80 (10 nm)/Co90Fe10 (3 nm)/Cu (2.2 nm)/(Co84Fe10B4 (10 nm)/Ta (5 nm)] structure that generated a 7.3 Oe exchange-bias field and 5.73% magnetoresistance. Fe3O4 nanoparticles were synthesized by a chemical coprecipitation method utilizing Moringa oleifera (MO) leaf extract as a natural reducing agent. The green-synthesized Fe3O4 nanoparticles exhibited a cubic inverse spinel structure as a pristine Fe3O4 characteristic. The crystallite size of green-synthesized Fe3O4 was larger than that of Fe3O4, reaching ∼ 14 nm, and formed a particle size of 29.1 nm. Its magnetic properties included soft ferromagnetic behavior with 55.5 emu/g saturation magnetization and 54 Oe coercivity; its saturation was lower than that of Fe3O4 due to the presence of the phytochemical compound of MO extract. In addition, to observe its potency as a magnetic label for biosensing, conventionally synthesized nanoparticles, surface modification using polyethylene glycol (PEG), and attachment of an α-amylase enzyme as a biomarker sample on green nanoparticle labels were also investigated. When measuring various concentration labels using the SV-GMR thin film, the green-synthesized Fe3O4 achieved a linear relationship and a better sensitivity of 0.098 mV/mg/mL than that of the conventional compound. The sensor could detect Fe3O4-labelled α-amylase enzyme as indicated by the decreasing output voltage, a consequence of altering the surface conditions of the nanoparticles. Therefore, green-synthesized nanoparticles are reliable and achieve competitive performance as magnetic labels in GMR sensors.

Dian Kesumapramudya Nurputra, Ahmad Kusumaatmaja, Mohamad Saifudin Hakim, Shidiq Nur Hidayat, Trisna Julian, Budi Sumanto, Yodi Mahendradhata, Antonia Morita Iswari Saktiawati, Hutomo Suryo Wasisto, Kuwat Triyana

https://doi.org/10.1038/s41746-022-00661-2

Journal : NPJ Digital Medicine

Volume 5, August 2022, 1-17

Abstract

The reverse transcription-quantitative polymerase chain reaction (RT-qPCR) approach has been widely used to detect the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). However, instead of using it alone, clinicians often prefer to diagnose the coronavirus disease 2019 (COVID-19) by utilizing a combination of clinical signs and symptoms, laboratory test, imaging measurement (e.g., chest computed tomography scan), and multivariable clinical prediction models, including the electronic nose. Here, we report on the development and use of a low cost, noninvasive method to rapidly sniff out COVID-19 based on a portable electronic nose (GeNose C19) integrating an array of metal oxide semiconductor gas sensors, optimized feature extraction, and machine learning models. This approach was evaluated in profiling tests involving a total of 615 breath samples composed of 333 positive and 282 negative samples. The samples were obtained from 43 positive and 40 negative COVID-19 patients, respectively, and confirmed with RT-qPCR at two hospitals located in the Special Region of Yogyakarta, Indonesia. Four different machine learning algorithms (i.e., linear discriminant analysis, support vector machine, stacked multilayer perceptron, and deep neural network) were utilized to identify the top-performing pattern recognition methods and to obtain a high system detection accuracy (88–95%), sensitivity (86–94%), and specificity (88–95%) levels from the testing datasets. Our results suggest that GeNose C19 can be considered a highly potential breathalyzer for fast COVID-19 screening.

Andi Marwanti Panre, Ilyas Maulana Yahya, Juharni Juharni, Edi Suharyadi

DOI 10.1088/2043-6262/ac4996

Journal: Advances in Natural Sciences: Nanoscience and Nanotechnology

Volume 12, January 2022, 045011

Abstract

The magneto-optic surface plasmon resonance (MOSPR) properties of core-shell Fe3O4@Ag nanoparticles (NPs) were successfully investigated using the Kretschmann configuration. The four layer configuration system consists of prism/Au/Fe3O4@Ag/air. At the plasmon resonance frequency, a prominent resonant enhancement of magneto-optical activity was observed. An external magnetic field of 40, 50 and 60 Oe was applied in the longitudinal, polar, and transversal configurations with variation in the positive and negative directions in the longitudinal configuration. In the longitudinal configuration, the SPR angle shifted to the larger and lower angles when an external magnetic field was applied in the positive and negative directions, respectively. Under an external magnetic field, the SPR angle shifted to the larger angle for polar and transversal configurations. The non-reciprocal reflection of light was exploited under an external magnetic field applied to core-shell Fe3O4@Ag magnetic NPs. The SPR angle shift is observed in each configuration. The results indicated that the MOSPR system might be used for next generation of biosensor application.

Nur Aji Wibowo, Juharni Juharni, Harsojo Sabarman, Edi Suharyadi

DOI: 10.1149/ 2162-8777/ac2d4e

Journal: ECS Journal of Solid State Science and Technology

Volume 10, October 2021, 107002

Abstract

The availability of rapid-portable instruments to monitor the bovine serum albumin (BSA) concentration is vital in the early detection of disease. In this research, an original biosensing method based on a spin-valve giant magnetoresistance as a transducer and magnetite@silver core–shell magnetic nanoparticles (MNPs) as a tag has been proposed for detecting BSA. The synthesized magnetite@silver MNPs tag size is ≈15 nm with ≈52 emu g−1 of saturation magnetization. This proposed biosensor performs rapid detection of BSA through the shifting of the switching magnetic field and the increasing of the output voltage. The effectivity of the sensor in monitoring the BSA concentration was shown by a strong linear correlation with ≈0.06 mV/(mg/ml) of the sensitivity and ≈0.44 mg ml−1 of the detection limit. Moreover, the measurement result can be acquired rapidly up to 1 min with low external magnetic field assistance. Therefore, this biosensing technique can be promoted as a real-time portable biosensor.

Siti Amalia Sasmito, Muhammad Anshory, Ibnu Jihad, Moh. Adhib Ulil Absor

DOI: 10.1103/PhysRevB.104.115145

Journal : Physical Review B 104

Volume 104, September 2021, 115145

Abstract

The coexistence of ferroelectricity and spin-orbit coupling in noncentrosymmetric systems may allow for a nonvolatile control of spin textures in the momentum space by tuning the ferroelectric polarization. Based on first-principles calculations, supplemented with k⋅p analysis, we report the emergence of the reversible spin textures in the two-dimensional (2D) GaXY (Se, Te; Cl, Br, I) monolayer compounds, a new class of 2D materials exhibiting in-plane ferroelectricity. We find that due to the large in-plane ferroelectric polarization, unidirectional out-of-plane spin textures are induced in the topmost valence band having giant spin splitting. Importantly, such out-of-plane spin textures, which can host a long-lived helical spin mode known as a persistent spin helix, can be fully reversed by switching the direction of the in-plane ferroelectric polarization. We show that the application of an external in-plane electric field oriented oppositely to the in-plane ferroelectric polarization direction is an effective method to flip the orientation of the out-of-plane spin textures. Thus, our findings can open avenues for interplay between the unidirectional out-of-plane spin textures and the in-plane ferroelectricity in 2D materials, which is useful for efficient and nonvolatile spintronic devices.

Edi Suharyadi, Taufikuddin Alfansuri, Lia Saptini Handriani, Nur Aji Wibowo, Harsojo Sabarman

https://doi.org/10.1007/s10854-021-06859-6

Journal: Journal of Materials Science: Materials in Electronics

Volume 32, August 2021, 23958–23967

Abstract

Simple Wheatstone bridge-giant magnetoresistance (GMR) sensors with one and two spin-valve (SV) thin films were developed for detecting magnetic nanoparticles (MNPs). SV thin films with a Ta(2 nm)/Ir20Mn80(10 nm)/Co90Fe10(3 nm)/Cu(2.2 nm)/(Co90Fe10)92B8(10 nm)/Ta(5 nm) structure were fabricated using RF magnetron sputtering on Si/SiO2 substrates. Inverse spinel-structured Fe3O4 and Fe3O4/polyethylene glycol (PEG) MNPs were synthesized by coprecipitation methods. To investigate the GMR sensor response, MNPs-ethanol (10 μL) solutions were dropped on the surface of the thin films. The following changes in Fe3O4 were observed after coating with PEG: the size of the nanoparticles increased from 11 to 13 nm, and the saturation magnetization of Fe3O4 decreased from 77.0 to 49.6 emu/g, which can be attributed to the surface modifications by PEG polymer; furthermore, the coercivity increased from 51.2 to 61.5 Oe owing to the existence of the antiferromagnetic phase α-Fe2O3. The output voltage of the GMR sensor with one and two SV thin film elements for Fe3O4 changed by 2.2 and 5.5 mV, respectively, and the output voltage decreased to 1.4 and 1.5 mV, respectively, in the case of Fe3O4/PEG. The decrease in the output voltage was caused by the decrease in the saturation magnetization of Fe3O4 after coating with PEG.

Moh. Adhib Ulil Absor, Yusuf Faishal, Muhammad Anshory, Iman Santoso, Sholihun, Harsojo, Fumiyuki Ishii

DOI 10.1088/1361-648X/ac0383

Journal of Physics: Condensed Matter

Volume 33, June 2021, 305501

Abstract

The ability to control the spin textures in semiconductors is a fundamental step toward novel spintronic devices, while seeking desirable materials exhibiting persistent spin texture (PST) remains a key challenge. The PST is the property of materials preserving a unidirectional spin orientation in the momentum space, which has been predicted to support an extraordinarily long spin lifetime of carriers. Herein, by using first-principles density functional theory calculations, we report the emergence of the PST in the two-dimensional (2D) germanium monochalcogenides (GeMC). By considering two stable formation of the 2D GeMC, namely the pure GeX and Janus Ge2XY monolayers (X, Y = S, Se, and Te), we observed the PST around the valence band maximum where the spin orientation is enforced by the lower point group symmetry of the crystal. In the case of the pure GeX monolayers, we found that the PST is characterized by fully out-of-plane spin orientation protected by C2v point group, while the canted PST in the y–z plane is observed in the case of the Janus Ge2XY monolayers due to the lowering symmetry into Cs point group. More importantly, we find large spin–orbit coupling (SOC) parameters in which the PST sustains, which could be effectively tuned by in-plane strain. The large SOC parameter observed in the present systems leads to the small wavelength of the spatially periodic mode of the spin polarization, which is promising for realization of the short spin channel in the spin Hall transistor devices.

Edi Suharyadi, Taufikuddin Alfansuri

https://doi.org/10.4028/www.scientific.net/KEM.884.348

Journal: Key Engineering Materials

Vol. 884, May 2021, 348-352

Abstract

The Wheatstone bridge-giant magnetoresistance (GMR) sensor with single and double spin valve thin film was successfully developed for potential biomolecular detection. The GMR sensor with spin valves structure of [Ta (2nm)/IrMn (10nm)/CoFe (3nm)/Cu (2,2nm)/CoFeB (10nm)/Ta (5nm)] was fabricated using DC Magnetic Sputtering method. The Fe3O4 magnetic nanoparticles were synthesized by the co-precipitation method as a magnetic label. The magnetic properties of the Fe3O4 nanoparticles measured are the saturation magnetization (Ms) of 77.7 emu/g, remanence magnetization (Mr) of 7.7 emu/g, and coercivity (Hc) of 49 Oe. The X-ray diffraction pattern showed the inverse cubic spinel structure with an average crystal size of about 20.1 nm. Fe3O4 magnetic nanoparticles with various concentrations were used to be detected using a GMR sensor. The output voltage of the GMR sensor with the single and double spin-valve increased from 1.7 to 3.9 mV and 2.9 to 5.3 mV with the increase of the Fe3O4 concentration from 0 to 20 mg/mL, respectively.

Juharni Juharni, Ilyas Maulana, Edi Suharyadi, Takeshi Kato, Satoshi Iwata

https://doi.org/10.4028/www.scientific.net/KEM.884.337

Journal: Key Engineering Materials

Vol. 884, May 2021, 337-341

Abstract

The objective of this research is to advance the affectability of Surface Plasmon Resonance (SPR) biosensor utilizing core-shell Fe3O4@Ag nanoparticles (Fe3O4@Ag NPs) with a variation of Ag concentration (20, 40, 60, 80, 100) mM. Fe3O4@Ag NPs were synthesized by the aqueous solution method. The characterization by utilizing X-ray Diffractometer (XRD) depicts that the crystal structure of Fe3O4 compares to the cubic inverse spinel structure and based on Transmission Electron Microscopy (TEM) estimation, the particle size average of Fe3O4@Ag NPs is 14.45 nm. The magnetic properties of Fe3O4@Ag NPs were evaluated by Vibrating Sample Magnetometer (VSM), the result appears that the more concentration of Ag increases, the more remanent magnetization (Mr), saturation magnetization (Ms), and coercitivity field (Hc) diminishes. In this research, a Fe3O4@Ag NPs, a spherical nanoparticle consisting of a spherical Fe3O4 core covered by an Ag shell, was used as an active material to enhance the signal detection of SPR, with a wavelength of 632.8 nm in the Kretschmann configuration. The system consists of a four-layer material, i.e., prism/Au film/ Fe3O4@Ag NPs. The results show that the SPR angle shifted to the larger angle of incident light by using Fe3O4@Ag NPs. However, the effect of Ag concentration appears that the more concentration of Ag extends, the lower angle of SPR shifts. The addition of a core-shell in the conventional SPR-based biosensor leads to the enhancement of the SPR biosensor sensitivity if the fractional volume of the core-shell is large.