angular2 material checkbox checked or not

I am using angular 2 with material. I want to get the material checkbox checked or not when clicking the checkbox. I have done by passing click event to the component function. But it does not work when using material checkbox. It only works when using html check box.

<md-checkbox class="example-radio-button" [value]="hobby 1" (click)="hobbyClicked($event)">
    hobby 1
</md-checkbox>


hobbyClicked(evt){
    console.log(evt.target.checked);   // undefined
}