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Magnetization Dynamics of Reconfigurable 2D Magnonic Crystals
Published in Sergej O. Demokritov, Spin Wave Confinement, 2017
G. Shimon, A. Haldar, A. O. Adeyeye
Nanomagnet arrays and clusters are considered vital building blocks for many technological applications such as ultrahigh- density media [1–3], magnetic random access memory [4,5], logic [6–10], microwave signal processing devices [11–13], magnonics [14–21], and spin torque nano-oscillators (STOs) [22–26]. Some of these applications require nanomagnets to be packed more closely together in order to achieve higher-areal-density devices. Beyond the challenges for device fabrication and integration, the strength of dipolar interactions between neighboring nanomagnets is known to be significantly enhanced when interelement spacing becomes much smaller than their lateral dimensions. Such enhanced dipolar interaction has been found to largely modify magnetization reversal [27–29], switching field distribution [30–32], and dynamic magnetization reversal processes [33–36]. Dipolar interaction can also be engineered to realize functional magnetic systems. For example, magnetic quantum cellular automata (MQCA) have been utilized to perform logic operations and propagate magnetic information [6,9,37]. Similarly, artificial spin ice has been shown to produce localized spin wave (SW) or selective SW propagation based on defects or change of magnetization states [38–40]. Additionally, flavors of tunable dynamic behaviors were made possible by exploiting their dipolar interaction [11,33–36].
Four-State Hybrid Spintronics–Straintronics
Published in Tomasz Wojcicki, Krzysztof Iniewski, VLSI: Circuits for Emerging Applications, 2017
Noel D’Souza, Jayasimha Atulasimha, Supriyo Bandyopadhyay
By manipulating the shape of the nanomagnet, the magnetic properties of the element can be engineered, with different shapes giving rise to different anisotropic behaviors. For instance, Cowburn et al. (1999b) experimentally demonstrated that supermalloy (Ni80Fe14Mo5) nanomagnets with triangular, square, and pentagonal geometries (corresponding to rotational symmetries of order three, four, and five, respectively) exhibit anisotropy with 6-fold, 4-fold, and 10-fold symmetries, respectively. The anisotropies of these nanomagnets are measured using the modulated field magneto-optical anisotropy technique (Cowburn et al. 1997) and are shown in Figure 4.6a through c.
Four-State Hybrid Spintronics–Straintronics for Ultra-Low Power Computing
Published in Krzysztof Iniewski, Tomasz Brozek, Krzysztof Iniewski, Micro- and Nanoelectronics, 2017
Noel D’Souza, Jayasimha Atulasimha, Supriyo Bandyopadhyay
By manipulating the shape of the nanomagnet, the magnetic properties of the element can be engineered, with different shapes giving rise to different anisotropic behaviors. For instance, Cowburn et al. [35] experimentally demonstrated that supermalloy (Ni80Fe14Mo5) nanomagnets with triangular, square, and pentagonal geometries (corresponding to rotational symmetries of order three, four, and five, respectively) exhibit anisotropy with sixfold, fourfold, and tenfold symmetries, respectively. The anisotropies of these nanomagnets are measured using the modulated field magneto-optical anisotropy technique [36] and are illustrated in Figure 12.6a–c.
Overview of the application of inorganic nanomaterials in breast cancer diagnosis
Published in Inorganic and Nano-Metal Chemistry, 2022
Asghar Ashrafi Hafez, Ahmad Salimi, Zhaleh Jamali, Mohammad Shabani, Hiva Sheikhghaderi
Iron oxide nanoparticle is the main inorganic nanomagnetic, which is used as the contrast agent in MRI. Correspondingly, some of the composites based on the nanoparticle were provided e.g., MnFe2O4, CoFe2O4, and NiFe2O4.[120–122] The generality of two reasons for applied IONPs in MRI technique involves not only IONPs making negative (dark) contrast by shortening T2 relaxation time which elevates the resolution of MRI image,[123] but also IONPs is biocompatible and transformed to Fe to form hemoglobin or enter other metabolic processes.[124–126]