Effect of large mechanical stress on the magnetic properties of embedded Fe nanoparticles

Abstract

SummaryMagnetic nanoparticles are promising candidates for next generation high density magnetic data storage devices. Data storage requires precise control of the magnetic properties of materials, in which the magnetic anisotropy plays a dominant role. Since the total magneto-crystalline anisotropy energy scales with the particle volume, the storage density in media composed of individual nanoparticles is limited by the onset of superparamagnetism. One solution to overcome this limitation is the use of materials with extremely large magneto-crystalline anisotropy. In this article, we follow an alternative approach by using magneto-elastic interactions to tailor the total effective magnetic anisotropy of the nanoparticles. By applying large biaxial stress to nanoparticles embedded in a non-magnetic film, it is demonstrated that a significant modification of the magnetic properties can be achieved. The stress is applied to the nanoparticles through expansion of the substrate during hydrogen loading. Experimental evidence for stress induced magnetic effects is presented based on temperature-dependent magnetization curves of superparamagnetic Fe particles. The results show the potential of the approach for adjusting the magnetic properties of nanoparticles, which is essential for application in future data storage media.

Synthesis and Characterization of La0.8Sr0.1Ag0.1MnO3 Nano Perovskite Compound

“…In our case the investigatedsample have a magneto-static interaction. At the same time,the low value of the coercivity obtained qualifies the sample to be used in recording media to avoid the loss of the data bits [12]. …”

Magnetic behavior of Joule-heated magnetic core–shell nanowires with positive magnetostrictive core material

“…The is Laplace operator, ˛1 and ˛2 are the thermal expansion coefficients of core and shell materials in contact, v 1 and v 2 are the Poisson's coefficients for core and shells. The cylindrical stress components in core ( 1 rr , 1 , 1 zz ) and shell ( 1 rr , 1 , 1 zz ) were obtained by a coordinate transformation [10,11] of the Cartesian stress components given by the Eq. (5).…”

“…(1) with the boundary conditions (2)-(4). The thermal stress components in Cartesian coordinates were obtained as solutions of the equations presented in references [10,11]:…”

Preparation of octenyl succinic anhydride‐modified cassava starch by the ultrasonic‐assisted method and its influence mechanism

“…As a synthetic methodology induced by the input of mechanical energy, mechanochemistry is the process of converting mechanical forces into chemical energy (Willis‐Fox, Rognin, Aljohani, & Daly, ). The processes of mechanical forces on different materials are usually divided into three stages which are the stress stage, aggregation stage, and agglomeration stage, respectively (Saranu et al, ). At present, the researches on mechanochemistry mainly focused on the synthesis of crystalline materials.…”