Article
Chemistry, Physical
Fengxuan Han, Wei Du, Mengli Liu, Hua Su, Huaiwu Zhang, Bo Liu, Hao Meng, Xiaoli Tang
Summary: The Pt/Ta seed layer has been shown to enhance the thermal stability of PMA by providing efficient diffusion paths for Ta and increasing Fe-O bonding to improve PMA and its temperature stability compared to a Ta single seed layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Ke Wang, Yongming Tang, Xiaopeng Xiao, Zhan Xu, Jian Liu
Summary: TbFeCo alloy films with adjustable coercivity and perpendicular magnetic anisotropy can be achieved by controlling the sputtering power and gas flow rate during fabrication. Proper tuning of these parameters allows for the optimization of the films' magnetic properties, which is crucial for the design of high-density spintronic devices.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Tatsuya Yamamoto, Takayuki Nozaki, Kay Yakushiji, Shingo Tamaru, Hitoshi Kubota, Akio Fukushima, Shinji Yuasa
Summary: The study shows that Ta layer in MgO/Ta/CoFeB/MgO junctions can enhance the PMA of magnetic films and eliminate the diffusion of Ta, leading to superior thermal stability and the release of VCMA effect. In addition, the Co-Fe compositional variation in CoFeB layer associated with Ta insertion is related to the changes in PMA and VCMA.
Article
Chemistry, Physical
Talluri Manoj, Hari Prasanth Perumal, Bibekananda Paikaray, Arabinda Haldar, Jaivardhan Sinha, Pinaki Prasad Bhattacharjee, Chandrasekhar Murapaka
Summary: High entropy alloys have gained significant attention recently due to their unique microstructures and properties. Among them, the eutectic HEA AlCoCrFeNi2.1 is particularly attractive for its unprecedented mechanical properties. However, the functional properties of this alloy have not been well explored. In this study, researchers investigated the magnetic properties of nanocrystalline EHEA films grown by RF magnetron sputtering before and after annealing at different temperatures. The results showed the presence of perpendicular magnetic anisotropy (PMA) in the films annealed at 600 degrees C, while the as-deposited and annealed samples at lower temperatures only exhibited in-plane anisotropy behavior. The presence of PMA was attributed to the formation of Al2O3 on the film surface.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Applied
Mio Ishibashi, Kay Yakushiji, Masashi Kawaguchi, Arata Tsukamoto, Satoru Nakatsuji, Masamitsu Hayashi
Summary: The magnetic properties of rare earth-transition metal ferrimagnetic thin films are studied. It is found that the compensation of magnetic moments of rare earth and transition metal sublattices increases with decreasing film thickness. For thin TbFeCo films, Tb atoms do not contribute to the magnetization. The perpendicular magnetic anisotropy increases with a thin Co layer but drops to zero with a thin Tb layer. The Tb concentration at which magnetic compensation occurs decreases when the underlayer is changed from Pt to Ta.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Ramesh Chandra Bhatt, Lin-Xiu Ye, Nian-Ci Huang, Te-ho Wu
Summary: In this study, the temperature-dependent anomalous Hall effect (AHE) in sandwich structures composed of two ferrimagnetic (FIM) layers with different coercivities was investigated using rare-earth transition-metal (RE-TM) materials. Complex triple AHE loops were obtained near the compensation temperature of GdFeCo, and a model was developed to explain these loops, considering the magnetization reversal of the individual layers, Hall sign reversal, and the spin-flop transition in the GdFeCo layer. This study elucidates the mechanism behind the unusual temperature-dependent AHE response of technologically important RE-TM FIM films for spintronics applications.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Chemistry, Physical
Qingwang Bai, Jie Jiang, Bin Guo, Wentian Cao, Xianwu Xiu, Shuyun Wang
Summary: Increasing the interfaces of heavy metal ferromagnetic (HM/FM) can enhance the perpendicular magnetic anisotropy (PMA) of multilayers. The addition of more Pd/CMS interfaces can improve PMA and magnetic saturation (M-s), leading to reduced energy consumption in magnetic recording writing.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Yu-Ting Chow, Pei-Cheng Jiang, Cheng-Hsun-Tony Chang, Tien-Szu Shen, Yih-Shing Lee, Jyh-Shen Tsay, Chii-Ruey Lin
Summary: In order to meet the rapid and large data flow requirements for 5G cloud generation, it is essential to develop warm storage device technology in the market that strikes a balance between reading/writing performance and storage capacity price. The technologies of warm storage devices are expected to utilize phase change memory, resistive random access memory or magnetoresistive random access memory, which have high potential for 5G structures. Through investigating the magnetic properties of Co on non-hydrogenated diamond like carbon films, a self-assembled magnetic heterostructure has been discovered, with applications in developing warm memory devices.
Article
Engineering, Electrical & Electronic
D. Ourdani, Y. Roussigne, S. M. Cherif, M. Gabor, M. Belmeguenai
Summary: The effects of ferromagnetic layer thickness and annealing temperature on Pt-/Co-/MgO-based systems were studied. The magnetization at saturation and magnetic dead layer thickness were found to be insignificantly affected by annealing. Different linear regimes were observed in the Co effective thickness dependence of the effective magnetization, showing contributions from magnetoelastic anisotropy and annealing temperature on anisotropy constants. Surface iDMI constants decreased with increasing annealing temperature, with no clear correlation to interface PMA constants.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Chemistry, Physical
Z. X. Ye, X. T. Zhao, W. Liu, L. Liu, J. X. Wu, Y. Li, J. Ma, H. Z. Ju, Y. H. Song, Z. D. Zhanga
Summary: The influence of Ta spacer layers on the microstructure and magnetic properties of Nd-Dy-Fe-Co-B thick films is systematically studied. Increasing the number and thickness of Ta spacer layers significantly enhances the perpendicular magnetic anisotropy while maintaining a coercivity of around 2 T. The Ta spacer layer facilitates the formation of the out-of-plane texture and enhances the pinning effect, resulting in high coercivity.
SURFACES AND INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Yanjie Wang, Xiaoyuan Nie, Junhui Song, Chao Wang, Fan Yang, Yaodan Chi, Xiaotian Yang, Ye Shen, Chunyan Xu
Summary: Using first-principles calculations, the diffusion process of B atoms and the origin of perpendicular magnetic anisotropy (PMA) in MgO|CoFe|Ta structures with boron were studied. It was observed that B atoms are more likely to enter the Ta layer than the FeCo and MgO layers, which is consistent with experimental and theoretical results. The physical origin of the interfacial PMA in the Ta|CoFe|MgO structure with B element was also elucidated and found to come from both the MgO|CoFe and CoFe|Ta layer interfaces. These findings provide a comprehensive understanding of PMA and suggest the potential for achieving high thermal stability in advanced-node STT-MRAM.
RESULTS IN PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Zurbiye Capku, Fikret Yildiz
Summary: This study investigates YIG films with perpendicular magnetic anisotropy on Si substrates, showing multiple spin wave modes excited through ferromagnetic resonance. The exchange stiffness constant of YIG films was estimated between 1.02 x 10(-9) and 5.12 x 10(-9) Oe.cm(2). These findings are expected to drive investment in advanced magnonics, insulator spintronics, and quantum information processing applications.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
R. A. One, S. Mican, A. Mesaros, M. Gabor, T. Petrisor, M. Joldos, L. D. Buda-Prejbeanu, C. Tiusan
Summary: Ab initio calculations predict that adding Pt at the top of the Co/MgO interface in Pt/Co/MgO ultrathin structures would enhance perpendicular magnetic anisotropy and its electric field variation rate. Experimental results show that the measured voltage anisotropy modulation effect is qualitatively consistent with theoretical predictions.
IEEE TRANSACTIONS ON MAGNETICS
(2021)
Article
Materials Science, Multidisciplinary
E. Yuzuak, G. D. Yuzuak, I Ennen, A. Huetten
Summary: This study systematically investigated the properties of Tb(25)Fe(6)1Co(14) thin films and found that increasing the thickness of the Pt underlayer helped enhance the perpendicular magnetic anisotropy. It was also discovered that these films exhibited out-of-plane magnetic anisotropy even without annealing.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Sicong Jiang, Safdar Nazir, Kesong Yang
Summary: This study presents a high-throughput screening approach to find candidate Heusler/MgO material interfaces for spintronic applications. By utilizing open quantum material repositories and conducting large-scale ab initio calculations, the researchers identified five full-Heusler compounds and two half-Heusler compounds as promising candidates for designing p-MTJs.
ACS APPLIED MATERIALS & INTERFACES
(2022)
