Micro magnetic dendritic domain structure in the demagnetized state of perpendicular magnetic ultrathin film: The effect of the width of the distribution of the energy barriers

Minimization of the Electric Energy in Systems Using Ultra-High Density Magnetic Storage

“…(7), we can calculate the value of 0 for the three samples. We notice that by using 0 = 10 4 we get high values of 0 compared to those measured experimentally [10]. This leads us to think about the real value of 0 in a real sample.…”

“…The fitting of expérimental dots of 1/2 vs μ 0 H and their ajustement by eq (2) allows to have the values of t 0 , ̅ and M s V B for differents samples represented on figure 1. And in table 2 According to the work of A. Adanlété Adjanoh, R. Belhi [10,11], the weakness of ̅ confirms the fact that the magnetization reversal in thises samples is mainly done by domain wall motion in the sample. In a real sample the magnetic domains have a dendritic structure as shown in image of fig.…”

“…The high value within 0.8nm can be explained by a high defect rate in this sample. These defects slow down the magnetization reversal process [10] ; hence this increases the width of the distribution of the energy barries in the sample. We find respectively μ 0 H r = 16.19mT, μ 0 H r = 15.80mT and μ 0 H r = 10.04mT for the thickness t C o = 0.7nm, 0.8nm and 1nm.…”

“…But the activation energy is not single in a real sample. In this case the simple activation energy is replaced by a distribution of energy barriers [10]. The lower the distribution of energy barriers, the less electrical energy is needed for the storage of information.…”